Question 1

Which of the following best explains why birds and mammals have a four-chambered heart, while amphibians typically have a three-chambered heart?

Accepted Answer

A four-chambered heart allows for complete separation of oxygenated and deoxygenated blood, maximizing oxygen delivery to tissues needed for high metabolic rates.

Question 2

A patient has a blood pressure reading of $$120/70$$ mmHg. What does the $$70$$ mmHg value represent?

Accepted Answer

The pressure in the arteries during ventricular relaxation (diastolic pressure).

Question 3

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

Accepted Answer

Transporting oxygen to the lungs.

Question 4

A marathon runner trains at high altitude for several weeks. Which physiological change is most likely to occur, and what is the underlying hormone involved?

Accepted Answer

Increased production of erythrocytes (RBCs) due to elevated erythropoietin (EPO) secretion.

Question 5

Which of the following statements about gas exchange in animals is correct?

Accepted Answer

Insects use a tracheal system that delivers oxygen directly to tissues without involving the circulatory system.

Question 6

A person inhales cigarette smoke regularly. Which of the following is a direct effect of smoking on the respiratory system?

Accepted Answer

Accumulation of mucus in the airways, leading to smoker's cough.

Question 7

During digestion, which hormone is released in response to acidic chyme entering the small intestine, and what is its primary effect?

Accepted Answer

Secretin; stimulates the pancreas to release bicarbonate to neutralize acid.

Question 8

Which of the following best describes the path of urine from its formation to excretion in humans?

Accepted Answer

Renal pelvis $$\rightarrow$$ ureter $$\rightarrow$$ bladder $$\rightarrow$$ urethra

Question 9

A person is dehydrated and their body needs to conserve water. Which hormone is most likely to be released, and what is its effect on the nephron?

Accepted Answer

Antidiuretic hormone (ADH); increases water reabsorption in the distal tubule and collecting duct.

Question 10

Which of the following is a correct match between an animal group and its primary nitrogenous waste product?

Accepted Answer

Birds — uric acid

Question 11

A patient’s blood test shows a low level of HDL and a high level of LDL. What health risk is most directly associated with this profile?

Accepted Answer

Increased risk of atherosclerosis due to plaque buildup in arteries.

Question 12

Which of the following best explains why desert mammals have long loops of Henle in their nephrons?

Accepted Answer

Long loops of Henle allow for greater water reabsorption, producing more concentrated urine.

Question 13

Which of the following statements about blood components is correct?

Accepted Answer

Erythrocytes are the most abundant blood cells and are responsible for oxygen transport via hemoglobin.

Question 14

Which of the following best describes the main mechanism by which gases such as O$$_2$$ and CO$$_2$$ move across animal respiratory surfaces?

Accepted Answer

Simple diffusion down their concentration gradients.

Question 15

A person consumes a meal high in fat. Which process and structures are primarily responsible for the absorption of these fats?

Accepted Answer

Fats are absorbed as chylomicrons into lacteals of the lymphatic system.

Question 16

Which of the following best explains why humans must obtain vitamin C from their diet?

Accepted Answer

Humans lack the enzyme required to synthesize vitamin C.

Question 17

Which of the following correctly matches an excretory structure with the organism in which it is found?

Accepted Answer

Malpighian tubules — insects

Question 18

Which of the following best describes the main function of the SA node in the human heart?

Accepted Answer

It acts as the pacemaker, initiating the heartbeat by stimulating the atria to contract.

Question 19

Which of the following is a correct sequence of structures through which filtrate passes in a nephron?

Accepted Answer

Glomerular capsule $$\rightarrow$$ proximal tubule $$\rightarrow$$ loop of Henle $$\rightarrow$$ distal tubule $$\rightarrow$$ collecting duct

Question 20

A person with a deficiency in thrombin would most likely experience which of the following problems?

Accepted Answer

Impaired blood clotting due to failure to convert fibrinogen to fibrin.

Animal Circulation, Respiration, Digestion, and Excretion: Study Guide

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