TEAS 7 EXAM– QUESTIONS AND ANSWERS | VERIFIED AND
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1. Which of the following hierarchical levels of organization is the most inclusive?
A. Organ
B. Tissue
C. Organism
D. Population
ANSWER: D. Population
A population includes all individuals of a single species living within a specific area, making
it more inclusive than an individual organism, organ, or tissue. Levels of organization scale
from cells to tissues, organs, organ systems, organisms, populations, communities, ecosystems,
and the biosphere.
2. Which cellular organelle is primarily responsible for the synthesis of adenosine
triphosphate (ATP) through cellular respiration?
A. Ribosome
B. Mitochondrion
C. Golgi apparatus
D. Endoplasmic reticulum
ANSWER: B. Mitochondrion
Mitochondria are known as the powerhouses of the cell because they generate most of the
cell's supply of ATP used as a source of chemical energy. Ribosomes synthesize proteins, the
Golgi apparatus modifies and packages proteins, and the endoplasmic reticulum is involved in
lipid and protein synthesis.
3. What is the primary function of the myelin sheath in the nervous system?
A. To produce neurotransmitters
B. To increase the speed of impulse propagation
C. To nourish the neuron cell body
D. To integrate sensory information
ANSWER: B. To increase the speed of impulse propagation
, The myelin sheath acts as an electrical insulator that surrounds nerve fibers, significantly
increasing the speed at which electrical impulses travel along the axon via saltatory
conduction. Neurotransmitters are produced and stored in axon terminals, not the myelin
sheath.
4. Which blood vessel type is directly responsible for the exchange of oxygen, carbon
dioxide, and nutrients between the blood and surrounding tissues?
A. Arteries
B. Arterioles
C. Capillaries
D. Veins
ANSWER: C. Capillaries
Capillaries have extremely thin walls composed of a single layer of endothelial cells, which
facilitates efficient diffusion of gases, nutrients, and waste products between the blood and
interstitial fluid. Arteries and arterioles transport blood away from the heart under high
pressure, while veins return blood to the heart.
5. During a routine physical examination, a patient displays a resting heart rate of 110
beats per minute. How is this clinical finding properly classified?
A. Bradycardia
B. Tachycardia
C. Normocardia
D. Asystole
ANSWER: B. Tachycardia
Tachycardia is defined as a resting heart rate above the normal adult range, typically
exceeding 100 beats per minute. Bradycardia refers to a resting heart rate below 60 beats per
minute, normocardia represents a normal resting heart rate, and asystole denotes a complete
absence of cardiac electrical activity.
6. Which enzyme is primarily responsible for initiating the chemical digestion of
carbohydrates in the human oral cavity?
A. Pepsin
B. Lipase
C. Amylase
D. Trypsin
ANSWER: C. Amylase
, Salivary amylase is secreted by the salivary glands and begins the breakdown of complex
starches into simpler sugars within the mouth. Pepsin digests proteins in the stomach, lipase
breaks down lipids primarily in the small intestine, and trypsin is a pancreatic protease that
further digests proteins in the small intestine.
7. Which component of blood plays the most critical role in the initiation of blood clotting
and hemostasis?
A. Erythrocytes
B. Leukocytes
C. Thrombocytes
D. Plasma proteins
ANSWER: C. Thrombocytes
Thrombocytes, commonly known as platelets, aggregate at sites of vascular injury and release
clotting factors to form a plug that stops bleeding. Erythrocytes transport oxygen, leukocytes
provide immune defense, and while plasma proteins like fibrinogen assist in clotting, platelets
are the primary cellular fragments responsible for initial hemostasis.
8. Which anatomical plane divides the human body into left and right portions?
A. Transverse plane
B. Frontal plane
C. Sagittal plane
D. Coronal plane
ANSWER: C. Sagittal plane
The sagittal plane divides the body vertically into left and right sections; a midsagittal plane
divides it into equal halves. The transverse plane divides the body into superior and inferior
portions, while the frontal or coronal plane divides it into anterior and posterior portions.
9. Which specific region of the brain is primarily responsible for regulating vital autonomic
functions such as heart rate, respiration, and blood pressure?
A. Cerebellum
B. Medulla oblongata
C. Hypothalamus
D. Cerebrum
ANSWER: B. Medulla oblongata
The medulla oblongata, located within the brainstem, contains autonomic reflex centers that
regulate involuntary life-sustaining functions including breathing, heart rate, and blood
pressure. The cerebellum coordinates balance and voluntary movement, the hypothalamus
, regulates body temperature and endocrine functions, and the cerebrum handles higher-level
cognitive processing.
10. What is the primary functional unit of human skeletal muscle responsible for
contraction?
A. Sarcolemma
B. Sarcoplasmic reticulum
C. Sarcomere
D. Myofibril
ANSWER: C. Sarcomere
_ The sarcomere is the basic contractile unit of striated muscle tissue, composed of
overlapping actin and myosin filaments. The sarcolemma is the cell membrane of a muscle
fiber, the sarcoplasmic reticulum stores and releases calcium ions, and myofibrils are bundled
chains of sarcomeres.
11. Which hormone is released by the posterior pituitary gland to stimulate uterine
contractions during childbirth and promote milk ejection during lactation?
A. Estrogen
B. Oxytocin
C. Progesterone
D. Prolactin
ANSWER: B. Oxytocin
Oxytocin is produced in the hypothalamus and stored/released by the posterior pituitary gland
to stimulate smooth muscle contraction in the uterus and mammary glands. Prolactin,
produced by the anterior pituitary, stimulates milk production rather than ejection. Estrogen
and progesterone are primarily ovarian hormones regulating the menstrual cycle and
pregnancy maintenance.
12. Which type of chemical bond involves the complete transfer of valence electrons from
one atom to another, resulting in oppositely charged ions?
A. Covalent bond
B. Hydrogen bond
C. Ionic bond
D. Metallic bond
ANSWER: C. Ionic bond
An ionic bond is formed when one or more electrons are transferred completely from a metal
to a nonmetal, creating electrostatic attraction between positive cations and negative anions.
WELL DETAILED ANSWERS PLUS RATIONALES | GUARANTEED
PASS | LATEST EXAM UPDATE | EXAM PREP | STUDY GUIDE |
PRACTICE TEST| DOWNLOAD INSTANT PDF
1. Which of the following hierarchical levels of organization is the most inclusive?
A. Organ
B. Tissue
C. Organism
D. Population
ANSWER: D. Population
A population includes all individuals of a single species living within a specific area, making
it more inclusive than an individual organism, organ, or tissue. Levels of organization scale
from cells to tissues, organs, organ systems, organisms, populations, communities, ecosystems,
and the biosphere.
2. Which cellular organelle is primarily responsible for the synthesis of adenosine
triphosphate (ATP) through cellular respiration?
A. Ribosome
B. Mitochondrion
C. Golgi apparatus
D. Endoplasmic reticulum
ANSWER: B. Mitochondrion
Mitochondria are known as the powerhouses of the cell because they generate most of the
cell's supply of ATP used as a source of chemical energy. Ribosomes synthesize proteins, the
Golgi apparatus modifies and packages proteins, and the endoplasmic reticulum is involved in
lipid and protein synthesis.
3. What is the primary function of the myelin sheath in the nervous system?
A. To produce neurotransmitters
B. To increase the speed of impulse propagation
C. To nourish the neuron cell body
D. To integrate sensory information
ANSWER: B. To increase the speed of impulse propagation
, The myelin sheath acts as an electrical insulator that surrounds nerve fibers, significantly
increasing the speed at which electrical impulses travel along the axon via saltatory
conduction. Neurotransmitters are produced and stored in axon terminals, not the myelin
sheath.
4. Which blood vessel type is directly responsible for the exchange of oxygen, carbon
dioxide, and nutrients between the blood and surrounding tissues?
A. Arteries
B. Arterioles
C. Capillaries
D. Veins
ANSWER: C. Capillaries
Capillaries have extremely thin walls composed of a single layer of endothelial cells, which
facilitates efficient diffusion of gases, nutrients, and waste products between the blood and
interstitial fluid. Arteries and arterioles transport blood away from the heart under high
pressure, while veins return blood to the heart.
5. During a routine physical examination, a patient displays a resting heart rate of 110
beats per minute. How is this clinical finding properly classified?
A. Bradycardia
B. Tachycardia
C. Normocardia
D. Asystole
ANSWER: B. Tachycardia
Tachycardia is defined as a resting heart rate above the normal adult range, typically
exceeding 100 beats per minute. Bradycardia refers to a resting heart rate below 60 beats per
minute, normocardia represents a normal resting heart rate, and asystole denotes a complete
absence of cardiac electrical activity.
6. Which enzyme is primarily responsible for initiating the chemical digestion of
carbohydrates in the human oral cavity?
A. Pepsin
B. Lipase
C. Amylase
D. Trypsin
ANSWER: C. Amylase
, Salivary amylase is secreted by the salivary glands and begins the breakdown of complex
starches into simpler sugars within the mouth. Pepsin digests proteins in the stomach, lipase
breaks down lipids primarily in the small intestine, and trypsin is a pancreatic protease that
further digests proteins in the small intestine.
7. Which component of blood plays the most critical role in the initiation of blood clotting
and hemostasis?
A. Erythrocytes
B. Leukocytes
C. Thrombocytes
D. Plasma proteins
ANSWER: C. Thrombocytes
Thrombocytes, commonly known as platelets, aggregate at sites of vascular injury and release
clotting factors to form a plug that stops bleeding. Erythrocytes transport oxygen, leukocytes
provide immune defense, and while plasma proteins like fibrinogen assist in clotting, platelets
are the primary cellular fragments responsible for initial hemostasis.
8. Which anatomical plane divides the human body into left and right portions?
A. Transverse plane
B. Frontal plane
C. Sagittal plane
D. Coronal plane
ANSWER: C. Sagittal plane
The sagittal plane divides the body vertically into left and right sections; a midsagittal plane
divides it into equal halves. The transverse plane divides the body into superior and inferior
portions, while the frontal or coronal plane divides it into anterior and posterior portions.
9. Which specific region of the brain is primarily responsible for regulating vital autonomic
functions such as heart rate, respiration, and blood pressure?
A. Cerebellum
B. Medulla oblongata
C. Hypothalamus
D. Cerebrum
ANSWER: B. Medulla oblongata
The medulla oblongata, located within the brainstem, contains autonomic reflex centers that
regulate involuntary life-sustaining functions including breathing, heart rate, and blood
pressure. The cerebellum coordinates balance and voluntary movement, the hypothalamus
, regulates body temperature and endocrine functions, and the cerebrum handles higher-level
cognitive processing.
10. What is the primary functional unit of human skeletal muscle responsible for
contraction?
A. Sarcolemma
B. Sarcoplasmic reticulum
C. Sarcomere
D. Myofibril
ANSWER: C. Sarcomere
_ The sarcomere is the basic contractile unit of striated muscle tissue, composed of
overlapping actin and myosin filaments. The sarcolemma is the cell membrane of a muscle
fiber, the sarcoplasmic reticulum stores and releases calcium ions, and myofibrils are bundled
chains of sarcomeres.
11. Which hormone is released by the posterior pituitary gland to stimulate uterine
contractions during childbirth and promote milk ejection during lactation?
A. Estrogen
B. Oxytocin
C. Progesterone
D. Prolactin
ANSWER: B. Oxytocin
Oxytocin is produced in the hypothalamus and stored/released by the posterior pituitary gland
to stimulate smooth muscle contraction in the uterus and mammary glands. Prolactin,
produced by the anterior pituitary, stimulates milk production rather than ejection. Estrogen
and progesterone are primarily ovarian hormones regulating the menstrual cycle and
pregnancy maintenance.
12. Which type of chemical bond involves the complete transfer of valence electrons from
one atom to another, resulting in oppositely charged ions?
A. Covalent bond
B. Hydrogen bond
C. Ionic bond
D. Metallic bond
ANSWER: C. Ionic bond
An ionic bond is formed when one or more electrons are transferred completely from a metal
to a nonmetal, creating electrostatic attraction between positive cations and negative anions.
