ATI TEAS SCIENCE PRACTICE TEST
EXAM WITH ACTUAL
CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS|FREQUENTLY
TESTED QUESTIONS AND
SOLUTIONS|NEWEST|GUARANTEED
PASS 2026/2027
On average, how many protons does one atom of zinc (Zn) have?
Atomic # - 30
Atomic mass - 65.39
A. 30
B. 35
C. 35.99
D. 65.39
A. 30
The number of protons is the same for every atom of a given element and is the elements's atomic
number; in this case 30 for Zinc (Zn).
Which statement below correctly describes the movement of molecules in the body and/or in relation
to the external environment?
A. Osmosis is the movement of a solution from and area of low solute concentration to an area of high
solute concentration.
B. Diffusion is the process in the lungs by which oxygen is transported from the air to the blood.
C. Dissipation is the transport of molecules across a semipermeable membrane from an area of low
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,concentration to high concentration, requiring energy.
D. Reverse osmosis is the movement of molecules in a solution from an area of high concentration to an
area of lower concentration.
B. In the lungs, oxygen is transported from the air to the blood through the process of diffusion.
In which molecules passively move from an area of high concentration to low concentration.
Specifically, the alveolar membranes withdraw the oxygen form the air in the lungs into the
bloodstream.
- Osmosis is the passive movement of a water from an area of low solute concentration to an area of
higher solute concentration through a permeable membrane.
- Reverse osmosis is the active transport of water opposite the concentration gradient from an area of
low solute concentration to high solute concentration.
- Dissipation is a more general reference of the spread or loss of energy.
Which gland is responsible for the regulation of calcium levels?
A. the parathyroid glands
B. the pituitary gland
C. the adrenal glands
D. the pancreas
A. The parathyroid glands
The parathyroid glands are four small glands that is on top of the thyroid gland and regulate calcium
levels by secreting parathyroid hormone.
The hormone regulates the amount of calcium and magnesium that is excreted by the kidneys into the
urine.
Which statement matches the function to the organ of the digestive system?
A. The large intestine reabsorbs water in the body to form solid waste.
B The duodenum is the middle section of the small intestine in which acids, fat, and sugar are absorbed.
C. The jejunum is the first part of the small intestine that receives chyme form the stomach and further
digests it prior to entering the large intestine.
D. The gallbladder produces insulin to assist in the transport of sugars form the blood to the organs.
A. The large intestine's main function is the reaborsptlon of water into the body to form solid waste.
It also allows for the absorption of vitamin K produced by microbes living inside the large intestine.
- The duodenum is the first second of the small intestine that receives partially digested food from the
stomach, also called chyme, further digestion tit with the help of enzymes released by the gall bladder,
before it enters into the small intestine.
- The pancreases (not the gall bladder) releases insulin to assist in the removal and transport of sugar in
the body.
- The jejunum is the second portion of the small intestine in which amino acids, fatty acids, and sugars
are absorbed.
2|Page
,In your garden, you noticed that the tomato plants did better on the north side of your house than the
west side and you decided to figure out why. They are both planted with the same soil that provides
adequate nutrients to the plant, and they are watered at the same time during the week. Over the
course of a week, you begin to measure the amount of sunlight that hits each side of the house and
determine that the north side gets more light because the sunlight is blocked by the house's shadow on
the west side. What is the name of the factor in your observations that affected the tomato plants
growth?
A. the control
B. the independent variable
C. the dependent variable
D. The conclusion
B. The conclusion was that the amount of sunlight received by the pants was affecting their growth.
- The independent variable was the amount of light that was given to the plants and could have been
manipulated by the experiment by moving the plants or adding equal parts of light.
- No control was used in this experiment.
Which of the following describes one responsibility of the integumentary system?
A. Distributing vital substances (such as nutrients) throughout the body
B. Blocking pathogens that cause disease
C. Sending leaked fluids from cardiovascular system back to the blood vessels
D. sorting bodily hormones that influence gender traits.
B. The integumentary system includes skin, hair, and mucous membranes, all of which are responsible-in
part, at least-for blocking disease-causing pathogens from entering the bloodstream.
- The circulatory system distributes vital substances through the body.
- The lymphatic system sends leaked fluids from the cardiovascular system back to the blood vessels.
- The reproductive system stores bodily hormones that influence gender traits.
When are the parasympathetic nerves active within the nervous system?
A. when an individual experiences a strong emotion, such as fear or excitement.
B. when an individual feels pain or heat.
C. when an individual is either talking or walking.
D. when an individual is either resting or eating.
D. The parasympathetic nerves are active when an individual is ether resting or eating.
- The sympathetic nerves are active when an individual experience a strong emotion, such as fear or
excitement.
- Feeling pain and hat fall under the responsibility of the sensory neurons.
Talking and walking fall under the responsibility of the ganglia within the sensory-somatic nervous
system.
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, Which of the following best described the relationship between the circulatory system and the
integumentary system?
A. removal of excess heat from body.
B. hormonal influence on blood pressure
C. regulation of blood's pressure and volume.
D. development of blood cells within marrow.
A. The integumentary system coordinates with the circulatory system to remove excess heat form the
body. The superficial blood vessels (those nearest the surface of the skin) dilate to allow the heat to exit
the Boyd.
- The hormonal influence on blood pressure is the result of the relationship between the circulatory
system and the endocrine system.
- The urinary system is responsible for assisting the regulation of blood's pressure and volume.
- The skeletal system is responsible for assisting the development of blood vessels within the marrow.
Which of the following statements describes the path of blood entering into the heart?
A. Blood enters the heart through the pulmonary vein, into the right atrium, through the tricuspid have
to the right ventricle.
B. Once the right ventricle is full, blood exits into the pulmonary artery and then empties into the left
ventricle.
C. After traveling through the lungs, oxygenated blood enters into the left atrium, then through the
mitral valve to the left ventricle.
D. Once the left ventricle is full, the left tricuspid valve shuts, the ventricle contracts, and blood exists
through the aorta.
C. Blood returns to the heart from both the inferior and superior vena cava, entering into the right
atrium, though the tricuspid valve, and into the right ventricle. Once the right ventricle is full, the
tricuspid valve closes, and upon heart contraction, the blood is pumped through the pulmonary artery,
becoming oxygenated in the lungs. The blood returns to the heart from the lungs through the
pulmonary vein, into the left atrium, through the mitral valve, and into the left ventricle. When the left
ventricle is full, the mitral valve closes, and the hart contracts and distributes the newly oxygenated
blood throughout the Boyd through the aortic valve and into the aorta.
The part of the human excretory system most responsible for maintaining normal body temperature is
the :
A. kidney
B. bladder.
C. liver
D. sweat glands
D. Blood is cooled as it passes through capillaries surround the sweat glands.
Heat is absorbed along with excess salt and water and transferred to the glands as sweat.
Droplets of sweat then evaporate from the skin surface to dissipate heat and cool the body
- The kidney, bladder, and liver are NOT involved in regulating body temperature.
4|Page
EXAM WITH ACTUAL
CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS|FREQUENTLY
TESTED QUESTIONS AND
SOLUTIONS|NEWEST|GUARANTEED
PASS 2026/2027
On average, how many protons does one atom of zinc (Zn) have?
Atomic # - 30
Atomic mass - 65.39
A. 30
B. 35
C. 35.99
D. 65.39
A. 30
The number of protons is the same for every atom of a given element and is the elements's atomic
number; in this case 30 for Zinc (Zn).
Which statement below correctly describes the movement of molecules in the body and/or in relation
to the external environment?
A. Osmosis is the movement of a solution from and area of low solute concentration to an area of high
solute concentration.
B. Diffusion is the process in the lungs by which oxygen is transported from the air to the blood.
C. Dissipation is the transport of molecules across a semipermeable membrane from an area of low
1|Page
,concentration to high concentration, requiring energy.
D. Reverse osmosis is the movement of molecules in a solution from an area of high concentration to an
area of lower concentration.
B. In the lungs, oxygen is transported from the air to the blood through the process of diffusion.
In which molecules passively move from an area of high concentration to low concentration.
Specifically, the alveolar membranes withdraw the oxygen form the air in the lungs into the
bloodstream.
- Osmosis is the passive movement of a water from an area of low solute concentration to an area of
higher solute concentration through a permeable membrane.
- Reverse osmosis is the active transport of water opposite the concentration gradient from an area of
low solute concentration to high solute concentration.
- Dissipation is a more general reference of the spread or loss of energy.
Which gland is responsible for the regulation of calcium levels?
A. the parathyroid glands
B. the pituitary gland
C. the adrenal glands
D. the pancreas
A. The parathyroid glands
The parathyroid glands are four small glands that is on top of the thyroid gland and regulate calcium
levels by secreting parathyroid hormone.
The hormone regulates the amount of calcium and magnesium that is excreted by the kidneys into the
urine.
Which statement matches the function to the organ of the digestive system?
A. The large intestine reabsorbs water in the body to form solid waste.
B The duodenum is the middle section of the small intestine in which acids, fat, and sugar are absorbed.
C. The jejunum is the first part of the small intestine that receives chyme form the stomach and further
digests it prior to entering the large intestine.
D. The gallbladder produces insulin to assist in the transport of sugars form the blood to the organs.
A. The large intestine's main function is the reaborsptlon of water into the body to form solid waste.
It also allows for the absorption of vitamin K produced by microbes living inside the large intestine.
- The duodenum is the first second of the small intestine that receives partially digested food from the
stomach, also called chyme, further digestion tit with the help of enzymes released by the gall bladder,
before it enters into the small intestine.
- The pancreases (not the gall bladder) releases insulin to assist in the removal and transport of sugar in
the body.
- The jejunum is the second portion of the small intestine in which amino acids, fatty acids, and sugars
are absorbed.
2|Page
,In your garden, you noticed that the tomato plants did better on the north side of your house than the
west side and you decided to figure out why. They are both planted with the same soil that provides
adequate nutrients to the plant, and they are watered at the same time during the week. Over the
course of a week, you begin to measure the amount of sunlight that hits each side of the house and
determine that the north side gets more light because the sunlight is blocked by the house's shadow on
the west side. What is the name of the factor in your observations that affected the tomato plants
growth?
A. the control
B. the independent variable
C. the dependent variable
D. The conclusion
B. The conclusion was that the amount of sunlight received by the pants was affecting their growth.
- The independent variable was the amount of light that was given to the plants and could have been
manipulated by the experiment by moving the plants or adding equal parts of light.
- No control was used in this experiment.
Which of the following describes one responsibility of the integumentary system?
A. Distributing vital substances (such as nutrients) throughout the body
B. Blocking pathogens that cause disease
C. Sending leaked fluids from cardiovascular system back to the blood vessels
D. sorting bodily hormones that influence gender traits.
B. The integumentary system includes skin, hair, and mucous membranes, all of which are responsible-in
part, at least-for blocking disease-causing pathogens from entering the bloodstream.
- The circulatory system distributes vital substances through the body.
- The lymphatic system sends leaked fluids from the cardiovascular system back to the blood vessels.
- The reproductive system stores bodily hormones that influence gender traits.
When are the parasympathetic nerves active within the nervous system?
A. when an individual experiences a strong emotion, such as fear or excitement.
B. when an individual feels pain or heat.
C. when an individual is either talking or walking.
D. when an individual is either resting or eating.
D. The parasympathetic nerves are active when an individual is ether resting or eating.
- The sympathetic nerves are active when an individual experience a strong emotion, such as fear or
excitement.
- Feeling pain and hat fall under the responsibility of the sensory neurons.
Talking and walking fall under the responsibility of the ganglia within the sensory-somatic nervous
system.
3|Page
, Which of the following best described the relationship between the circulatory system and the
integumentary system?
A. removal of excess heat from body.
B. hormonal influence on blood pressure
C. regulation of blood's pressure and volume.
D. development of blood cells within marrow.
A. The integumentary system coordinates with the circulatory system to remove excess heat form the
body. The superficial blood vessels (those nearest the surface of the skin) dilate to allow the heat to exit
the Boyd.
- The hormonal influence on blood pressure is the result of the relationship between the circulatory
system and the endocrine system.
- The urinary system is responsible for assisting the regulation of blood's pressure and volume.
- The skeletal system is responsible for assisting the development of blood vessels within the marrow.
Which of the following statements describes the path of blood entering into the heart?
A. Blood enters the heart through the pulmonary vein, into the right atrium, through the tricuspid have
to the right ventricle.
B. Once the right ventricle is full, blood exits into the pulmonary artery and then empties into the left
ventricle.
C. After traveling through the lungs, oxygenated blood enters into the left atrium, then through the
mitral valve to the left ventricle.
D. Once the left ventricle is full, the left tricuspid valve shuts, the ventricle contracts, and blood exists
through the aorta.
C. Blood returns to the heart from both the inferior and superior vena cava, entering into the right
atrium, though the tricuspid valve, and into the right ventricle. Once the right ventricle is full, the
tricuspid valve closes, and upon heart contraction, the blood is pumped through the pulmonary artery,
becoming oxygenated in the lungs. The blood returns to the heart from the lungs through the
pulmonary vein, into the left atrium, through the mitral valve, and into the left ventricle. When the left
ventricle is full, the mitral valve closes, and the hart contracts and distributes the newly oxygenated
blood throughout the Boyd through the aortic valve and into the aorta.
The part of the human excretory system most responsible for maintaining normal body temperature is
the :
A. kidney
B. bladder.
C. liver
D. sweat glands
D. Blood is cooled as it passes through capillaries surround the sweat glands.
Heat is absorbed along with excess salt and water and transferred to the glands as sweat.
Droplets of sweat then evaporate from the skin surface to dissipate heat and cool the body
- The kidney, bladder, and liver are NOT involved in regulating body temperature.
4|Page
