Q: Which of the following equations best represents the concept of mass balance in physiology?

$$\text{Mass balance} = \text{Mass intake} - \text{Mass output}$$

Question 1

Which statement best describes the principle of complementarity of structure and function in human anatomy and physiology?

Accepted Answer

Anatomical structure always reflects function; what a structure can do depends on its specific form.

Question 2

A patient presents with a body temperature of 39°C (102.2°F). Which homeostatic mechanism is most likely to be activated to restore normal temperature?

Accepted Answer

Negative feedback, triggering mechanisms such as sweating and vasodilation.

Question 3

Which of the following best illustrates a positive feedback mechanism in the human body?

Accepted Answer

Release of oxytocin during childbirth, intensifying uterine contractions.

Question 4

Which directional term correctly describes the position of the heart relative to the breastbone (sternum)?

Accepted Answer

Posterior

Question 5

A surgeon makes a cut that divides the body into right and left parts. Which anatomical plane is used?

Accepted Answer

Sagittal plane

Question 6

Which of the following is NOT a component of a typical homeostatic control mechanism?

Accepted Answer

Stimulus generator

Question 7

If blood glucose levels rise after a meal, which sequence correctly describes the negative feedback response?

Accepted Answer

Pancreas releases insulin, promoting glucose uptake by cells and lowering blood glucose.

Question 8

Which body cavity contains the lungs?

Accepted Answer

Thoracic cavity

Question 9

A stab wound penetrates the parietal pericardium. Which organ is at risk?

Accepted Answer

Heart

Question 10

Which of the following best describes the role of serous fluid in body cavities?

Accepted Answer

It lubricates and reduces friction between organs and cavity walls.

Question 11

Which region of the abdominopelvic cavity contains the urinary bladder?

Accepted Answer

Hypogastric (pubic) region

Question 12

A patient has a homeostatic imbalance resulting in high blood pressure. What is the most likely consequence if this imbalance persists?

Accepted Answer

There is an increased risk of disease, such as stroke or heart failure.

Question 13

Which of the following is an example of microscopic anatomy?

Accepted Answer

Examining the layers of the heart wall with a microscope.

Question 14

Which directional term describes the position of the navel relative to the chin?

Accepted Answer

Inferior

Question 15

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

Accepted Answer

It transmits information from the receptor to the control center.

Question 16

Which organ is located in the right upper quadrant (RUQ) of the abdominopelvic cavity?

Accepted Answer

Liver

Question 17

Which of the following equations best represents the concept of mass balance in physiology?

Accepted Answer

$$	ext{Mass balance} = 	ext{Mass intake} - 	ext{Mass output}$$

Question 18

A patient is experiencing rapid blood loss. Which feedback mechanism is most likely to be activated to prevent further loss?

Accepted Answer

Positive feedback, accelerating the clotting process.

Question 19

Which of the following best describes the relationship between aging and homeostatic imbalance?

Accepted Answer

Aging is associated with increased homeostatic imbalance and higher risk of disease.

Question 20

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

Accepted Answer

Stimulus → Receptor → Control center → Effector

The Human Body: An Orientation – Study Notes for Anatomy & Physiology

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