Question 1

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

Accepted Answer

A tendency of the body to maintain a relatively stable internal environment through dynamic equilibrium.

Question 2

Which of the following is an example of a homeostatically-regulated factor?

Accepted Answer

The osmolarity of body fluids.

Question 3

Which compartment is NOT part of the extracellular fluid (ECF)?

Accepted Answer

Intracellular fluid (ICF)

Question 4

A patient’s blood pH is measured at 7.10. Which homeostatic concept does this scenario best illustrate?

Accepted Answer

The body is outside the set point for pH and homeostatic mechanisms will attempt to restore balance.

Question 5

Which of the following best describes a negative feedback loop?

Accepted Answer

It reverses the direction of change to maintain homeostasis.

Question 6

In the control of body temperature, what role do skeletal muscles play when the body temperature drops below normal?

Accepted Answer

They act as effectors by shivering to produce heat.

Question 7

Which of the following is a correct sequence of the three components of a feedback loop?

Accepted Answer

Sensor → Control Center → Effector

Question 8

A thermostat in a room detects a drop in temperature and turns on the heater. Once the set point is reached, the heater turns off. This is an example of:

Accepted Answer

Negative feedback

Question 9

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

Accepted Answer

Sealing of a blood vessel by platelets during injury

Question 10

During childbirth, stretching of the cervix leads to increased release of oxytocin, which causes more uterine contractions and further stretching. This is an example of:

Accepted Answer

Positive feedback

Question 11

Which of the following best explains why positive feedback loops are less common than negative feedback loops in the body?

Accepted Answer

Positive feedback loops do not help maintain homeostasis.

Question 12

If the set point for blood pressure is $$120/80$$ mmHg, what would happen if blood pressure rises to $$150/100$$ mmHg?

Accepted Answer

A negative feedback loop would activate to lower blood pressure.

Question 13

Which of the following is the best definition of a set point in homeostasis?

Accepted Answer

The ideal value or range for a regulated variable.

Question 14

A patient is dehydrated, leading to increased osmolarity of the extracellular fluid (ECF). Which homeostatic response is most likely to occur?

Accepted Answer

The kidneys will conserve water to decrease ECF osmolarity.

Question 15

Which of the following best describes the role of the control center in a feedback loop?

Accepted Answer

It processes information and determines the appropriate response.

Question 16

Which of the following scenarios best illustrates the concept of dynamic equilibrium in homeostasis?

Accepted Answer

Blood glucose levels fluctuate slightly around a set point after eating and fasting.

Question 17

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

Accepted Answer

Enzyme

Question 18

A person is exposed to cold weather, causing their body temperature to drop. Which of the following best describes the sequence of events in the negative feedback loop that restores temperature?

Accepted Answer

Receptors detect change → Control center processes information → Effectors (muscles) shiver to produce heat

Question 19

Which of the following statements about the extracellular fluid (ECF) is correct?

Accepted Answer

It includes both interstitial fluid and plasma.

Question 20

Which of the following best explains why the positive feedback loop in blood clotting is considered beneficial?

Accepted Answer

It quickly amplifies the response to seal a damaged blood vessel, preventing excessive blood loss.

Homeostasis and Feedback Mechanisms in Anatomy & Physiology

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드