Question 1

Which of the following best defines homeostasis?

Accepted Answer

The maintenance of a stable internal environment despite external changes.

Question 2

In a typical negative feedback loop regulating body temperature, which component detects changes in temperature?

Accepted Answer

Receptor

Question 3

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

Accepted Answer

Release of oxytocin during childbirth to intensify uterine contractions

Question 4

Compare the roles of the control center and the effector in a feedback loop. Which statement is correct?

Accepted Answer

The control center detects changes and initiates a response, while the effector receives the signal and carries out the response.

Question 5

Which equation best represents the concept of homeostasis in terms of physiological variables?

Accepted Answer

$$\Delta X = X_{measured} - X_{set\ point}$$

Question 6

Which cell type is primarily responsible for bone formation during growth and development?

Accepted Answer

Osteoblast

Question 7

During bone remodeling, which hormone increases blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 8

Which of the following best describes the function of chondrocytes in the skeletal system?

Accepted Answer

They produce and maintain the cartilaginous matrix.

Question 9

A patient suffers a fracture in the diaphysis of the femur. Which tissue type is primarily involved in the initial soft callus formation?

Accepted Answer

Fibrocartilage

Question 10

Which feedback mechanism is most likely to be involved in the regulation of blood calcium levels after a meal rich in calcium?

Accepted Answer

Negative feedback loop involving calcitonin release

Question 11

Which of the following best explains why negative feedback loops are more common than positive feedback loops in maintaining homeostasis?

Accepted Answer

Negative feedback loops counteract deviations from a set point, promoting stability.

Question 12

Which of the following is NOT a function of the skeletal system?

Accepted Answer

Regulation of body temperature

Question 13

Which cell type is responsible for bone resorption during bone remodeling?

Accepted Answer

Osteoclast

Question 14

A patient with low blood calcium is given a medication that mimics parathyroid hormone. What is the expected effect on bone tissue?

Accepted Answer

Increased activity of osteoclasts leading to bone resorption

Question 15

Which of the following best describes the sequence of events in fracture repair?

Accepted Answer

Hematoma formation, fibrocartilaginous callus formation, bony callus formation, bone remodeling

Question 16

Which hormone is primarily responsible for stimulating bone growth during childhood and adolescence?

Accepted Answer

Growth hormone

Question 17

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

Accepted Answer

It receives input from receptors and determines the appropriate response.

Question 18

Which of the following equations represents the relationship between bone mass and bone formation/resorption rates?

Accepted Answer

$$\Delta M = R_{formation} - R_{resorption}$$

Question 19

Which feedback loop would be most appropriate for the regulation of blood glucose after a meal?

Accepted Answer

Negative feedback loop involving insulin release

Question 20

Which of the following best describes the function of fibroblasts in fracture repair?

Accepted Answer

They produce collagen fibers that form the soft callus.

Homeostasis, Feedback Loops, and Physiology of the Skeletal System: Study Notes

Study Guide - Practice Questions