Question 1

Which of the following best describes the concept of homeostasis?

Accepted Answer

The body's ability to maintain a relatively stable internal environment despite external changes.

Question 2

A patient is experiencing a fever. Which of the following best describes the negative feedback mechanism that helps return body temperature to normal?

Accepted Answer

Receptors detect the increased temperature, the hypothalamus signals sweat glands to increase sweat production, and body temperature decreases.

Question 3

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

Accepted Answer

During childbirth, the release of oxytocin increases uterine contractions, which in turn causes more oxytocin to be released.

Question 4

Which of the following best describes the role of phospholipids in the cell membrane?

Accepted Answer

They form a bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward, creating a selective barrier.

Question 5

A red blood cell is placed in a hypertonic solution. What will happen to the cell, and why?

Accepted Answer

The cell will shrink because water moves out of the cell to the area of higher solute concentration.

Question 6

Which of the following best explains why facilitated diffusion requires a membrane protein?

Accepted Answer

It allows hydrophilic substances to cross the hydrophobic core of the lipid bilayer.

Question 7

Which equation correctly represents the calculation of total body water (TBW) if extracellular fluid (ECF) is 1/3 of TBW and intracellular fluid (ICF) is 2/3 of TBW?

Accepted Answer

$$TBW = ECF + ICF$$

Question 8

A patient is given an intravenous solution with a lower osmolarity than their intracellular fluid (ICF). What is the likely effect on their red blood cells?

Accepted Answer

The cells will swell or burst as water moves into the cells.

Question 9

Which of the following best describes the function of carrier proteins in the cell membrane?

Accepted Answer

They transport specific molecules across the membrane by binding and changing shape.

Question 10

Which of the following best describes the process of phagocytosis?

Accepted Answer

The cell engulfs large solid particles, such as bacteria, by wrapping its membrane around them.

Question 11

Which of the following is a correct statement about active transport?

Accepted Answer

It requires ATP to move substances against their concentration gradient.

Question 12

A cell is placed in a solution with an osmolarity of $$400 	ext{mOsm/L}$$, while its ICF is $$300 	ext{mOsm/L}. $$What type of solution is this, and what will happen to the cell?

Accepted Answer

The solution is hypertonic; the cell will lose water and shrink.

Question 13

Which of the following best describes the function of glycocalyx on the cell membrane?

Accepted Answer

It serves as an identification marker, helping the immune system distinguish self from non-self.

Question 14

Which of the following is NOT a function of the cell membrane?

Accepted Answer

Synthesizing DNA for cell division.

Question 15

Which of the following best describes the difference between pinocytosis and phagocytosis?

Accepted Answer

Pinocytosis involves the uptake of liquids, while phagocytosis involves the uptake of large solid particles.

Question 16

Which of the following best explains why sodium-potassium pumps are essential for cell function?

Accepted Answer

They maintain the proper concentration gradients of sodium and potassium across the cell membrane, which is critical for nerve impulse transmission.

Question 17

Which of the following is the correct formula for calculating osmolarity if you know the number of solute particles and the volume of solution?

Accepted Answer

$$Osmolarity = \frac{	ext{Number of solute particles}}{	ext{Volume of solution (L)}}$$

Question 18

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

Accepted Answer

It contains the cell's DNA and controls cellular activities.

Question 19

A patient is severely dehydrated. Which of the following best describes the effect on their extracellular fluid (ECF) osmolarity and the movement of water between compartments?

Accepted Answer

ECF osmolarity increases, causing water to move out of cells into the ECF.

Question 20

Which of the following best describes the main storage sites for glycogen in the human body?

Accepted Answer

Liver and skeletal muscle.

Fundamentals of Cells and Homeostasis: Anatomy & Physiology Study Notes

Guida di studio - Domande di pratica

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