BIO 100 Exam 3 Review Questions with
Accurate Answers 2026 Updated.
Explain the functions of each system of the body: Digestive - Answer Mechanical and chemical
breakdown/digestion of food. Absorption of nutrients. Undigested waste product that is
eliminated.
Explain the functions of each system of the body: Cardiovascular (respiratory and circulatory) -
Answer Transportation (blood delivers oxygen and nutrients), regulation of body temperature,
and immunity
Explain the functions of each system of the body: Immune - Answer Battle infection, maintain
homeostasis by eliminating damaged cells, protects the body against foreign organisms.
Explain the functions of each system of the body: Skeletal - Answer support, movement,
storage of minerals (bone marrow) blood cell formation
Explain the functions of each system of the body: muscular - Answer movement, maintenance
of body posture, production of heat, contraction of the heart, blood pressure maintenance,
intestinal movement (elimination of feces)
Explain the functions of each system of the body: Endocrine - Answer Communication,
integration, and control (hormonally)
Explain the functions of each system of the body: Reproductive - Answer ensures survival of
the human race
Explain the functions of each system of the body: Nervous - Answer Communication,
integration, control, recognition of sensory stimuli (CNS & PNS)
Compare and contrast how positive and negative feedback mechanisms are used to maintain
homeostasis. Use these concepts to describe: The maintenance of blood glucose levels: -
Answer The control of blood sugar (glucose) by insulin is another good example of a negative
feedback mechanism. When blood sugar rises, receptors in the body sense a change. In turn,
the control center (pancreas) secretes insulin into the blood effectively lowering blood sugar
levels. Once blood sugar levels reach homeostasis, the pancreas stops releasing insulin.
Compare and contrast how positive and negative feedback mechanisms are used to maintain
homeostasis. Use these concepts to describe: The release of platelets to form blood clots: -
Answer once a vessel is damaged, platelets start to cling to the injured site and release
, chemicals that attract more platelets. The platelets continue to pile up and release chemicals
until a clot is formed.
What does it mean if an organism is an ectotherm? - Answer depend mainly on external heat
sources - their body temperature changes with the temperature of the environment (reptiles,
snakes, lizards)
What does it mean if an organism is an Endotherm? - Answer generate most of the heat they
need internally (mammals/humans/dogs)
Herbivorous mammals tend to have extremely long digestive systems, especially the intestines;
omnivores have intermediate length intestines; and carnivores have extremely short intestines.
What might be a logical explanation for this pattern? - Answer Plants are hard to break down
and need more time to get nutrients.
Why do strict vegetarians (vegans) have to be more careful of their choices of food than do
vegetarians that also eat cheese, eggs, and dairy products? - Answer Because they aren't
getting the vitamins and amino acids the body requires to function properly
How do vaccines work? - Answer The body will produce antibodies against the vaccine so
when you have the real thing your body will be prepared. You may not even get sick.
In Southern Copperhead snake venom; you'll find a protein called a disintegrin. Disintegrins bind
to a class of membrane receptors called integrins. Platelets use integrin receptors to aggregate
at a site of tissue damage. What effect do you think disintegrin has on the snake's prey? -
Answer The molecule interferes with clot formation so that the venom can travel more
efficiently from the site of the bite to the rest of the body.
Anatomical designs that increase surface area are common in many body systems. Give
examples of how surface area is maximized in the digestive, respiratory, and nervous systems of
humans. Digestive: - Answer it is folded so that the tract can have a lot of meters/surface area.
This allows for more absorption.
Anatomical designs that increase surface area are common in many body systems. Give
examples of how surface area is maximized in the digestive, respiratory, and nervous systems of
humans. Respiratory: - Answer alveoli allow for an increase in surface area, which maximizes
gas exchange
Anatomical designs that increase surface area are common in many body systems. Give
examples of how surface area is maximized in the digestive, respiratory, and nervous systems of
humans. Nervous System: - Answer Wrinkles in your brain increase surface area allowing for
more synaptic connections
Accurate Answers 2026 Updated.
Explain the functions of each system of the body: Digestive - Answer Mechanical and chemical
breakdown/digestion of food. Absorption of nutrients. Undigested waste product that is
eliminated.
Explain the functions of each system of the body: Cardiovascular (respiratory and circulatory) -
Answer Transportation (blood delivers oxygen and nutrients), regulation of body temperature,
and immunity
Explain the functions of each system of the body: Immune - Answer Battle infection, maintain
homeostasis by eliminating damaged cells, protects the body against foreign organisms.
Explain the functions of each system of the body: Skeletal - Answer support, movement,
storage of minerals (bone marrow) blood cell formation
Explain the functions of each system of the body: muscular - Answer movement, maintenance
of body posture, production of heat, contraction of the heart, blood pressure maintenance,
intestinal movement (elimination of feces)
Explain the functions of each system of the body: Endocrine - Answer Communication,
integration, and control (hormonally)
Explain the functions of each system of the body: Reproductive - Answer ensures survival of
the human race
Explain the functions of each system of the body: Nervous - Answer Communication,
integration, control, recognition of sensory stimuli (CNS & PNS)
Compare and contrast how positive and negative feedback mechanisms are used to maintain
homeostasis. Use these concepts to describe: The maintenance of blood glucose levels: -
Answer The control of blood sugar (glucose) by insulin is another good example of a negative
feedback mechanism. When blood sugar rises, receptors in the body sense a change. In turn,
the control center (pancreas) secretes insulin into the blood effectively lowering blood sugar
levels. Once blood sugar levels reach homeostasis, the pancreas stops releasing insulin.
Compare and contrast how positive and negative feedback mechanisms are used to maintain
homeostasis. Use these concepts to describe: The release of platelets to form blood clots: -
Answer once a vessel is damaged, platelets start to cling to the injured site and release
, chemicals that attract more platelets. The platelets continue to pile up and release chemicals
until a clot is formed.
What does it mean if an organism is an ectotherm? - Answer depend mainly on external heat
sources - their body temperature changes with the temperature of the environment (reptiles,
snakes, lizards)
What does it mean if an organism is an Endotherm? - Answer generate most of the heat they
need internally (mammals/humans/dogs)
Herbivorous mammals tend to have extremely long digestive systems, especially the intestines;
omnivores have intermediate length intestines; and carnivores have extremely short intestines.
What might be a logical explanation for this pattern? - Answer Plants are hard to break down
and need more time to get nutrients.
Why do strict vegetarians (vegans) have to be more careful of their choices of food than do
vegetarians that also eat cheese, eggs, and dairy products? - Answer Because they aren't
getting the vitamins and amino acids the body requires to function properly
How do vaccines work? - Answer The body will produce antibodies against the vaccine so
when you have the real thing your body will be prepared. You may not even get sick.
In Southern Copperhead snake venom; you'll find a protein called a disintegrin. Disintegrins bind
to a class of membrane receptors called integrins. Platelets use integrin receptors to aggregate
at a site of tissue damage. What effect do you think disintegrin has on the snake's prey? -
Answer The molecule interferes with clot formation so that the venom can travel more
efficiently from the site of the bite to the rest of the body.
Anatomical designs that increase surface area are common in many body systems. Give
examples of how surface area is maximized in the digestive, respiratory, and nervous systems of
humans. Digestive: - Answer it is folded so that the tract can have a lot of meters/surface area.
This allows for more absorption.
Anatomical designs that increase surface area are common in many body systems. Give
examples of how surface area is maximized in the digestive, respiratory, and nervous systems of
humans. Respiratory: - Answer alveoli allow for an increase in surface area, which maximizes
gas exchange
Anatomical designs that increase surface area are common in many body systems. Give
examples of how surface area is maximized in the digestive, respiratory, and nervous systems of
humans. Nervous System: - Answer Wrinkles in your brain increase surface area allowing for
more synaptic connections
