Question 1

Which of the following best describes homeostasis in the human body?

Accepted Answer

The process by which the body maintains a stable internal environment despite changes in external conditions.

Question 2

Which organ system is primarily responsible for transporting oxygen and nutrients throughout the body?

Accepted Answer

The circulatory system

Question 3

A patient is experiencing rapid breathing and sweating after running a marathon. Which feedback mechanism is most likely responsible for returning the body to homeostasis?

Accepted Answer

Negative feedback

Question 4

Which of the following is an example of positive feedback in the human body?

Accepted Answer

Release of oxytocin during childbirth to intensify uterine contractions

Question 5

If a person's blood glucose level rises after eating, which hormone is released to lower it back to normal?

Accepted Answer

Insulin

Question 6

Which of the following equations correctly represents the relationship between heart rate (HR), stroke volume (SV), and cardiac output (CO)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 7

A person is exposed to cold temperatures. Which physiological response helps maintain core body temperature?

Accepted Answer

Constriction of blood vessels near the skin (vasoconstriction)

Question 8

Which of the following best explains the role of the hypothalamus in homeostasis?

Accepted Answer

It acts as the body's control center, regulating temperature, hunger, and thirst.

Question 9

During childbirth, the stretching of the cervix causes the release of more oxytocin, which increases contractions. What type of feedback is this?

Accepted Answer

Positive feedback

Question 10

Which of the following is NOT a component of a typical negative feedback loop?

Accepted Answer

Amplifier

Question 11

A patient with diabetes mellitus has difficulty regulating blood glucose levels. Which part of the feedback loop is most likely malfunctioning?

Accepted Answer

Effector (pancreas)

Question 12

Which of the following best describes the function of baroreceptors?

Accepted Answer

They detect changes in blood pressure and send signals to the brain.

Question 13

Which equation would you use to calculate the mean arterial pressure (MAP) given systolic blood pressure (SBP) and diastolic blood pressure (DBP)?

Accepted Answer

$$MAP = DBP + \frac{1}{3}(SBP - DBP)$$

Question 14

Which of the following scenarios best illustrates a failure of homeostasis?

Accepted Answer

A person develops a fever that cannot be reduced by sweating or vasodilation.

Question 15

Which hormone is released by the pancreas to increase blood glucose levels when they are too low?

Accepted Answer

Glucagon

Question 16

A patient is admitted with dangerously high blood pressure. Which feedback mechanism would normally act to lower blood pressure?

Accepted Answer

Negative feedback via baroreceptors

Question 17

Which of the following is the correct sequence of events in a negative feedback loop?

Accepted Answer

Stimulus → Sensor → Control Center → Effector → Response

Question 18

Which of the following best describes the role of insulin in the body?

Accepted Answer

It facilitates the uptake of glucose into cells, lowering blood glucose levels.

Question 19

A person is exposed to a hot environment and begins to sweat. Which part of the feedback loop is responsible for producing sweat?

Accepted Answer

Effector

Question 20

Which of the following is a real-life example of negative feedback in the human body?

Accepted Answer

Regulation of blood glucose levels after a meal

Cellular Organization and Homeostasis in Anatomy & Physiology

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