Question 1

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

Accepted Answer

The maintenance of a stable internal environment despite external changes.

Question 2

Which equation correctly represents the osmotic pressure ($\Pi$) of a solution, and what does each variable represent?

Accepted Answer

$\Pi = iCRT$, where $i$ is the van 't Hoff factor, $C$ is the molar concentration, $R$ is the gas constant, and $T$ is the temperature in Kelvin.

Question 3

A patient is experiencing muscle weakness and irregular heartbeat. Lab results show high extracellular potassium ($K^+$) and low sodium ($Na^+$). Which type of equilibrium is most directly disrupted?

Accepted Answer

Chemical disequilibrium

Question 4

Which of the following best explains why the extracellular fluid (ECF) acts as a buffer zone between the outside world and most cells of the body?

Accepted Answer

It helps maintain stable conditions for cells by regulating the exchange of substances and protecting against rapid environmental changes.

Question 5

Which of the following is a correct example of negative feedback in the human body?

Accepted Answer

Increased blood glucose triggers insulin release, lowering blood glucose levels.

Question 6

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It requires a membrane protein but does not require energy.

Question 7

A cell is placed in a solution and water moves into the cell, causing it to swell. What type of solution is the cell in, and what is the direction of osmosis?

Accepted Answer

Hypotonic solution; water moves into the cell.

Question 8

Which of the following best describes the function of the sodium-potassium pump ($Na^+/K^+$ ATPase) in maintaining membrane potential?

Accepted Answer

It actively transports 3 $Na^+$ ions out and 2 $K^+$ ions into the cell, using ATP.

Question 9

Which hormone is released from the anterior pituitary in response to corticotropin-releasing hormone (CRH) from the hypothalamus?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 10

A patient has low levels of thyroid hormones (T3 and T4) and high levels of TSH. Where is the most likely site of dysfunction?

Accepted Answer

Thyroid gland

Question 11

Which of the following best describes the difference between a ligand and an antagonist?

Accepted Answer

A ligand binds to a receptor and triggers a cellular response, while an antagonist binds but does not elicit a response.

Question 12

Which of the following is an example of a carrier-mediated transport process that moves two different molecules in the same direction across a membrane?

Accepted Answer

Symport

Question 13

Which of the following best explains why lipid-soluble hormones can cross cell membranes more easily than water-soluble hormones?

Accepted Answer

Lipid-soluble hormones can diffuse through the phospholipid bilayer due to their nonpolar nature.

Question 14

Which of the following is a function of the Golgi apparatus in a eukaryotic cell?

Accepted Answer

It modifies and packages proteins into vesicles for transport.

Question 15

A patient with osteoporosis is found to have elevated parathyroid hormone (PTH) levels. Which of the following best explains the effect of PTH on bone?

Accepted Answer

PTH increases bone resorption, releasing calcium into the blood.

Question 16

Which of the following best describes the role of mitochondria in the cell?

Accepted Answer

They produce ATP through cellular respiration.

Question 17

Which of the following is a correct statement about the difference between the intracellular fluid (ICF) and extracellular fluid (ECF)?

Accepted Answer

ICF has higher potassium ($K^+$) and lower sodium ($Na^+$) than ECF.

Question 18

Which of the following best describes the function of lysosomes in a cell?

Accepted Answer

They contain digestive enzymes that break down waste materials and cellular debris.

Question 19

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

Accepted Answer

Uterine contractions during childbirth are stimulated by oxytocin, causing more contractions.

Anatomy & Physiology Study Guide: Homeostasis, Cell Physiology, Tissues, and Endocrine System

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