Question 1

Which of the following best describes the concept of homeostasis in biological systems?

Accepted Answer

The process by which organisms maintain a stable internal environment despite changes in external conditions.

Question 2

Arrange the following levels of biological organization in the correct order from smallest to largest: tissue, molecule, organ, cell, organism.

Accepted Answer

Molecule, cell, tissue, organ, organism

Question 3

Which of the following is a primary function of negative feedback in maintaining homeostasis?

Accepted Answer

To counteract changes in the internal environment and return conditions to a set point.

Question 4

Which tissue type is most abundant in primates and is responsible for movement?

Accepted Answer

Muscle tissue

Question 5

Cartilage is an example of which type of tissue, and what is its primary function?

Accepted Answer

Connective tissue; provides support and cushioning between bones

Question 6

Which of the following best describes the main feature of the alimentary canal in animals?

Accepted Answer

A digestive tract with two openings, a mouth and an anus

Question 7

Which type of feeder would a mosquito be classified as, and why?

Accepted Answer

Fluid feeder; it consumes liquid food from hosts

Question 8

What is the primary function of the pancreas in the digestive system?

Accepted Answer

To produce digestive enzymes and an alkaline solution

Question 9

Which of the following best explains why animals require a continuous supply of oxygen?

Accepted Answer

Oxygen is needed for cellular respiration to produce ATP, the energy currency of the cell.

Question 10

In insects, how does the respiratory system differ from that of mammals in terms of its relationship with the circulatory system?

Accepted Answer

Gas exchange occurs independently of the circulatory system in insects.

Question 11

Which structure in the human respiratory system is primarily responsible for gas exchange, and why?

Accepted Answer

Alveoli; they provide a large surface area for oxygen and carbon dioxide to diffuse across thin membranes.

Question 12

During inhalation in humans, which muscles contract to allow air to enter the lungs?

Accepted Answer

Diaphragm and rib muscles

Question 13

Why do larger animals require a circulatory system, whereas small, simple animals do not?

Accepted Answer

Diffusion alone is insufficient for transporting nutrients and wastes over larger distances in bigger animals.

Question 14

Which of the following statements about the circulatory system of arthropods is correct?

Accepted Answer

Arthropods have a hemolymph that is not separated into blood and interstitial fluid.

Question 15

Which vein carries oxygenated blood from the lungs to the heart in humans?

Accepted Answer

Pulmonary vein

Question 16

What is the main function of capillaries in the circulatory system?

Accepted Answer

To allow exchange of gases, nutrients, and wastes between blood and tissues

Question 17

Which side of the human heart pumps oxygen-poor blood to the lungs, and what is the name of this circuit?

Accepted Answer

Right side; pulmonary circuit

Question 18

A patient is experiencing heartburn due to stomach acid entering the esophagus. Which physiological process is most likely failing?

Accepted Answer

The lower esophageal sphincter is not closing properly.

Question 19

Which of the following equations correctly represents the overall process of cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}}$$

Question 20

A person is unable to absorb nutrients efficiently due to damage in the small intestine. Which process is most directly affected?

Accepted Answer

Hydrolysis of macromolecules into monomers before absorption

Study Notes: Animal Structure, Nutrition, Gas Exchange, and Circulation (Chapters 20–23)

Study Guide - Practice Questions