$$O_2$$ \text{ capacity} = 1.34 \times [Hb] \times $$SaO_2$$

Question 1

Which of the following best describes the function of photoreceptors in the retina?

Accepted Answer

They convert light energy into electrical signals for visual processing.

Question 2

A patient presents with loss of equilibrium and dizziness. Which structure is most likely affected?

Accepted Answer

Semicircular canals

Question 3

Which hormone is primarily responsible for regulating sodium levels in the body?

Accepted Answer

Aldosterone

Question 4

If a person has a deficiency in ADH (antidiuretic hormone), what is the most likely physiological consequence?

Accepted Answer

Excessive urination and dehydration

Question 5

Which of the following is the correct sequence of blood flow through the heart starting from the right atrium?

Accepted Answer

Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle → Aorta

Question 6

Which equation correctly represents the calculation of cardiac output ($$CO) in $$terms of heart rate ($$HR) $$and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 7

A patient has a blood type of AB. Which antibodies are present in their plasma?

Accepted Answer

Neither anti-A nor anti-B

Question 8

Which of the following best describes the role of the hypothalamus in the endocrine system?

Accepted Answer

It releases regulatory hormones that control the pituitary gland.

Question 9

Which cell type is primarily responsible for phagocytosis in the blood?

Accepted Answer

Neutrophils

Question 10

A patient is unable to taste sweet foods but can taste salty and sour. Which taste bud type is most likely dysfunctional?

Accepted Answer

Fungiform papillae

Question 11

Which hormone is released by the adrenal cortex and helps regulate sodium and potassium balance?

Accepted Answer

Aldosterone

Question 12

Which of the following is a function of the red blood cell?

Accepted Answer

Transporting oxygen using hemoglobin

Question 13

Which structure in the heart acts as the pacemaker, initiating electrical impulses?

Accepted Answer

SA node

Question 14

Which of the following best describes the function of antagonists in muscle movement?

Accepted Answer

They produce the opposite movement to the agonist.

Question 15

Which hormone stimulates ovarian secretion of estrogen and testicular secretion of testosterone?

Accepted Answer

Gonadotropins

Question 16

Which of the following is a correct function of the pericardial sac?

Accepted Answer

It prevents friction between the heart and surrounding tissues.

Question 17

Which equation represents the oxygen-carrying capacity of hemoglobin ($$O_2$$ capacity) in blood?

Accepted Answer

$$O_2$$ 	ext{ capacity} = 1.34 	imes [Hb] 	imes $$SaO_2$$

Question 18

Which of the following is a direct effect of oxytocin in the human body?

Accepted Answer

Stimulation of uterine contractions during childbirth

Question 19

A patient with a deficiency in fibrinogen would most likely experience which of the following?

Accepted Answer

Difficulty in blood clotting

Question 20

Which structure allows the olfactory nerve fibers to pass from the nasal cavity to the brain?

Accepted Answer

Cribriform plate of the ethmoid bone

Study Guide: Special Senses, Endocrine System, Blood, and the Heart

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