Question 1

Which of the following best describes the difference between the endocrine and nervous systems in terms of their method of communication and speed of response?

Accepted Answer

The endocrine system uses hormones released into the bloodstream for slower, longer-lasting effects, while the nervous system uses electrical impulses and neurotransmitters for rapid, short-term responses.

Question 2

Amino acid-based hormones and steroid hormones differ in their mechanism of action. Which statement correctly explains this difference?

Accepted Answer

Amino acid-based hormones bind to cell surface receptors and activate second messenger systems, while steroid hormones diffuse through the plasma membrane and bind to intracellular receptors.

Question 3

Which of the following is an example of humoral stimulus for hormone release?

Accepted Answer

Low blood calcium levels stimulating the parathyroid glands to release parathyroid hormone (PTH).

Question 4

Which hormone is produced by the posterior pituitary gland, and what is unique about its production?

Accepted Answer

Antidiuretic hormone (ADH), which is produced in the hypothalamus and stored in the posterior pituitary.

Question 5

A patient presents with symptoms of hyperglycemia and frequent urination. Laboratory tests show low insulin levels. Which hormone is most likely deficient, and what is its primary action?

Accepted Answer

Insulin; decreases blood glucose by promoting uptake of glucose into cells.

Question 6

During inspiration, which muscles are primarily engaged during quiet breathing, and what happens to the thoracic cavity volume?

Accepted Answer

Diaphragm and external intercostals contract, increasing thoracic cavity volume.

Question 7

Which equation correctly represents the relationship between pressure and volume during pulmonary ventilation, according to Boyle's Law?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 8

Most oxygen is transported in the blood by which mechanism?

Accepted Answer

Bound to hemoglobin within red blood cells.

Question 9

Which factor will shift the oxygen-hemoglobin dissociation curve to the right, indicating decreased hemoglobin affinity for oxygen?

Accepted Answer

Increased $$CO_2$$ concentration and decreased pH.

Question 10

Which of the following is the major nonelastic source of resistance to airflow in the lungs, and where does the greatest resistance occur?

Accepted Answer

Friction in the bronchioles; greatest resistance in medium-sized bronchi.

Question 11

Which enzyme in saliva initiates the digestion of carbohydrates in the mouth?

Accepted Answer

Amylase

Question 12

What is the chief pigment found in bile, and what is its origin?

Accepted Answer

Bilirubin; derived from the breakdown of hemoglobin.

Question 13

Which structure increases the surface area of the small intestine mucosa for nutrient absorption?

Accepted Answer

Villi and microvilli

Question 14

Which of the following best describes the function of the hepatic portal system?

Accepted Answer

It carries nutrient-rich blood from the digestive organs to the liver for processing.

Question 15

Which equation represents the balanced chemical reaction for aerobic cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + 36-38 ATP$$

Question 16

During the absorptive state, which hormone directs most metabolic events, and what is its primary effect?

Accepted Answer

Insulin; promotes glucose uptake and storage.

Question 17

Which nutrient yields the highest amount of energy per gram?

Accepted Answer

Lipids

Question 18

What is the primary function of NAD+ and FAD during cellular respiration?

Accepted Answer

They act as electron carriers, transporting electrons to the electron transport chain.

Question 19

Which mechanism is used by the body to resist shifts in blood pH caused by changes in $$CO_2$$ levels?

Accepted Answer

Buffer systems such as bicarbonate, respiratory compensation, and renal compensation.

Question 20

Which of the following best describes the difference between LDLs and HDLs?

Accepted Answer

LDLs transport cholesterol to tissues and are considered 'bad'; HDLs transport cholesterol away from tissues to the liver and are considered 'good'.

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