Q: Which of the following equations correctly represents the sodium-potassium exchange pump in cells?

$$2\mathrm{K}^+_{\text{in}} + 3\mathrm{Na}^+_{\text{out}} + \text{ATP} \rightarrow 2\mathrm{K}^+_{\text{in}} + 3\mathrm{Na}^+_{\text{out}}$$

Question 1

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

Accepted Answer

The process by which the body maintains a constant internal environment despite changes in external conditions.

Question 2

A patient is experiencing high blood glucose levels. Which homeostatic mechanism is most likely to be activated?

Accepted Answer

Negative feedback, where insulin is released to lower blood glucose.

Question 3

Which of the following correctly lists the six levels of structural organization in the human body from simplest to most complex?

Accepted Answer

Chemical, cellular, tissue, organ, organ system, organism

Question 4

Which anatomical plane divides the body into right and left halves?

Accepted Answer

Sagittal plane

Question 5

A cell is placed in a solution with a lower concentration of solutes than the cell's cytoplasm. What will happen to the cell?

Accepted Answer

Water will enter the cell, causing it to swell (hypotonic solution).

Question 6

Which of the following processes requires ATP and moves substances against their concentration gradient?

Accepted Answer

Active transport

Question 7

Which organelle is responsible for synthesizing proteins in the cell?

Accepted Answer

Ribosome

Question 8

A patient is diagnosed with a malignant tumor. Which of the following best describes this condition?

Accepted Answer

A mass of cells that invades surrounding tissues and can metastasize to other parts of the body.

Question 9

Which of the following is a function of the plasma membrane?

Accepted Answer

Regulates the movement of substances into and out of the cell.

Question 10

Which type of epithelial tissue is best suited for absorption and secretion, and is found lining the digestive tract?

Accepted Answer

Simple columnar epithelium

Question 11

Which connective tissue fiber is most abundant in bone and provides tensile strength?

Accepted Answer

Collagen fiber

Question 12

Which of the following best describes the difference between a chromosome and a gene?

Accepted Answer

A chromosome is a structure made of DNA that contains many genes; a gene is a segment of DNA that codes for a specific protein.

Question 13

Which of the following equations correctly represents the sodium-potassium exchange pump in cells?

Accepted Answer

$$2\mathrm{K}^+_{	ext{in}} + 3\mathrm{Na}^+_{	ext{out}} + 	ext{ATP} ightarrow 2\mathrm{K}^+_{	ext{in}} + 3\mathrm{Na}^+_{	ext{out}}$$

Question 14

Which of the following is a real-life example of positive feedback in the human body?

Accepted Answer

Release of oxytocin during childbirth to intensify uterine contractions.

Question 15

A patient undergoing chemotherapy reports feeling nauseated and losing hair. What is the most likely explanation for these symptoms?

Accepted Answer

Chemotherapy targets rapidly dividing cells, affecting both cancer cells and healthy cells such as those in the digestive tract and hair follicles.

Question 16

Which of the following best describes the function of goblet cells in epithelial tissue?

Accepted Answer

Secretion of mucus to protect and lubricate surfaces.

Question 17

Which process is described by the movement of water across a semi-permeable membrane from an area of low solute concentration to high solute concentration?

Accepted Answer

Osmosis

Question 18

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

Accepted Answer

Production of hormones for metabolism

Question 19

Which type of cell junction allows for direct communication between adjacent cells by permitting the passage of ions and small molecules?

Accepted Answer

Gap junction

Question 20

Which of the following best explains why stratified squamous epithelium is found in areas subject to abrasion, such as the skin and esophagus?

Accepted Answer

It consists of multiple layers of cells, providing protection against physical and chemical stress.

Anatomy & Physiology: Foundational Concepts and Tissues Study Guide

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