Q: Which of the following equations correctly calculates cardiac output?

$$\text{Cardiac Output} = \text{Heart Rate} \times \text{Stroke Volume}$$

Question 1

Which of the following best describes the role of negative feedback in maintaining homeostasis in the human body?

Accepted Answer

It reverses deviations from a set point to restore internal balance.

Question 2

A patient is found to have abnormally high levels of cortisol. Which of the following would you expect to observe as a result of negative feedback in the endocrine system?

Accepted Answer

Decreased secretion of CRH and ACTH.

Question 3

During labor, uterine contractions stimulate the release of oxytocin, which intensifies contractions. This is an example of:

Accepted Answer

Positive feedback

Question 4

Which of the following is an essential nutrient for animals and why?

Accepted Answer

Lysine, because it cannot be synthesized by the animal and is required for protein synthesis.

Question 5

In the stomach, which chemical is responsible for converting pepsinogen into its active form, pepsin?

Accepted Answer

Hydrochloric acid (HCl)

Question 6

Termites are able to digest cellulose because:

Accepted Answer

They have mutualistic bacteria in their hindgut that break down cellulose.

Question 7

If an animal consumes 2500 kcal per day, has a basal metabolic rate (BMR) of 1500 kcal/day, and burns 800 kcal/day through activity, what is its net energy balance? Use the formula: $$	ext{Net Energy} = \frac{	ext{Intake} - 	ext{BMR}}{	ext{Activity Burn Rate}}$$

Accepted Answer

$$\frac{2500 - 1500}{800} = 1.25$$

Question 8

Why are cells limited in size by their surface area-to-volume ratio?

Accepted Answer

As cells grow, their volume increases faster than surface area, limiting material exchange.

Question 9

A fish uses countercurrent exchange in its gills to maximize oxygen uptake. Which statement best explains this mechanism?

Accepted Answer

Blood and water flow in opposite directions, maintaining a gradient for oxygen diffusion along the entire gill.

Question 10

Which of the following equations correctly calculates cardiac output?

Accepted Answer

$$	ext{Cardiac Output} = 	ext{Heart Rate} 	imes 	ext{Stroke Volume}$$

Question 11

In humans, what primarily controls the rate of breathing?

Accepted Answer

Carbon dioxide levels in the blood

Question 12

Which of the following statements about spermatogenesis and oogenesis is correct?

Accepted Answer

Both require the same number of meiotic divisions to produce gametes.

Question 13

Why do terrestrial animals, such as the green anaconda, utilize internal fertilization?

Accepted Answer

To protect gametes from desiccation in a dry environment.

Question 14

A person is sweating profusely on a hot day. Which homeostatic mechanism is primarily responsible for this response?

Accepted Answer

Negative feedback to reduce body temperature.

Question 15

Which organ is primarily responsible for storing excess glucose as glycogen?

Accepted Answer

Liver

Question 16

A mutation causes the hypothalamus to malfunction, preventing it from detecting body temperature. Which of the following is a likely consequence?

Accepted Answer

The animal will be unable to regulate its body temperature effectively.

Question 17

Which of the following best illustrates a mutualistic relationship in animal digestion?

Accepted Answer

Termites hosting bacteria that digest cellulose.

Question 18

A patient with a damaged stomach lining is unable to produce sufficient HCl. What is a likely consequence for protein digestion?

Accepted Answer

Pepsinogen will not be converted to pepsin, impairing protein digestion.

Question 19

Which of the following scenarios best demonstrates the concept of positive feedback in physiology?

Accepted Answer

Uterine contractions during childbirth intensify as more oxytocin is released.

Question 20

Which of the following is a correct application of the cardiac output formula if a patient has a heart rate of 80 beats per minute and a stroke volume of 70 mL per beat?

Accepted Answer

$$	ext{Cardiac Output} = 80 	imes 70 = 5600 mL/$$min

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