Q: Which of the following equations best represents the relationship between stimulus, response, and homeostasis in a negative feedback loop?

$$\text{Stimulus} - \text{Response} = \text{Return to Homeostasis}$$

Question 1

Which of the following best describes the role of the effector in a negative feedback loop regulating body temperature?

Accepted Answer

It carries out the response directed by the control center to restore homeostasis.

Question 2

A patient’s blood glucose rises after a meal. Which sequence correctly describes the negative feedback mechanism that returns blood glucose to normal?

Accepted Answer

Receptor detects change → Control center releases insulin → Effector absorbs glucose → Blood glucose decreases

Question 3

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

Accepted Answer

Formation of a platelet plug during blood clotting

Question 4

If a transverse (horizontal) plane cuts through the umbilical region, which two body portions are created?

Accepted Answer

Superior and inferior portions

Question 5

Which serous membrane directly covers the surface of the heart?

Accepted Answer

Visceral pericardium

Question 6

A patient is experiencing pain in the right lower quadrant (RLQ) of the abdomen. Which organ is most likely involved?

Accepted Answer

Appendix

Question 7

Which directional term best describes the position of the nose relative to the ears?

Accepted Answer

Medial

Question 8

A midsagittal section of the body would pass through which of the following structures?

Accepted Answer

Urinary bladder

Question 9

Which of the following best explains why homeostatic imbalance increases the risk of disease?

Accepted Answer

It allows variables to fluctuate outside their normal range, disrupting normal cell function.

Question 10

Which body cavity contains both the heart and lungs?

Accepted Answer

Thoracic cavity

Question 11

A patient has a stab wound that penetrates the parietal pleura but not the visceral pleura. Which structure has been damaged?

Accepted Answer

The membrane lining the thoracic cavity wall

Question 12

Which of the following best describes the afferent pathway in a homeostatic control system?

Accepted Answer

It carries information from the receptor to the control center.

Question 13

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

Accepted Answer

Stimulus → Receptor → Control center → Effector → Response

Question 14

Which anatomical plane divides the body into anterior and posterior sections?

Accepted Answer

Frontal (coronal) plane

Question 15

A patient is lying face up on an examination table. What is the anatomical term for this position?

Accepted Answer

Supine

Question 16

Which region is immediately inferior to the umbilical region in the nine-region abdominopelvic division?

Accepted Answer

Hypogastric (pubic) region

Question 17

Which of the following equations best represents the relationship between stimulus, response, and homeostasis in a negative feedback loop?

Accepted Answer

$$	ext{Stimulus} - 	ext{Response} = 	ext{Return to Homeostasis}$$

Question 18

Which of the following best describes the function of serous fluid found between serous membranes?

Accepted Answer

It reduces friction between moving organs.

Question 19

Which body cavity would be entered first during an open-heart surgery?

Accepted Answer

Thoracic cavity

Question 20

A patient has a tumor located in the left hypochondriac region. Which organ is most likely affected?

Accepted Answer

Spleen

Chapter 1: The Human Body – An Orientation (Homeostasis, Anatomical Terms, Body Cavities)

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