Q: Which equation best represents the calculation of blood pH, given the concentrations of bicarbonate ($$[$$HCO_3$$^-]) $$and carbonic acid ($$[H_2CO_3]$$)?

$$\text{pH} = 6.1 + \log \left( \frac{[$$HCO_3$$^-]}{0.03 \times $$pCO_2$$} \right) $$

Question 1

Which structure is responsible for changing the shape of the lens to focus light on the retina?

Accepted Answer

Ciliary body

Question 2

A patient presents with fatigue, weight gain, and cold intolerance. Which hormone deficiency is most likely responsible for these symptoms?

Accepted Answer

Thyroid hormone

Question 3

Which cranial nerve is primarily responsible for transmitting taste sensations from the anterior two-thirds of the tongue?

Accepted Answer

Facial nerve (VII)

Question 4

What is the main function of the lacrimal gland?

Accepted Answer

Produces tears to lubricate and protect the eye

Question 5

Which hormone is released by the posterior pituitary and regulates urinary output by increasing water reabsorption in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 6

A loud noise causes damage to the hair cells in which part of the ear?

Accepted Answer

Cochlea

Question 7

Which plasma protein is most important for blood clotting and healing?

Accepted Answer

Fibrinogen

Question 8

The optic disc is known as the 'blind spot' because:

Accepted Answer

It lacks photoreceptors

Question 9

Which hormone is secreted by the C cells of the thyroid gland and helps regulate calcium levels?

Accepted Answer

Calcitonin

Question 10

Which vessel carries oxygen-rich blood from the lungs to the heart?

Accepted Answer

Pulmonary veins

Question 11

What is the average lifespan of a red blood cell (RBC) in human circulation?

Accepted Answer

About 120 days

Question 12

Which structure in the heart acts as the pacemaker, initiating the electrical impulse for contraction?

Accepted Answer

Sinoatrial (SA) node

Question 13

Which hormone stimulates the release of progesterone from the ovaries and testosterone from the testes?

Accepted Answer

Luteinizing hormone (LH)

Question 14

Which white blood cell is most abundant in human blood and is the first responder to bacterial infection?

Accepted Answer

Neutrophil

Question 15

Which equation best represents the calculation of blood pH, given the concentrations of bicarbonate ($$[$$HCO_3$$^-]) $$and carbonic acid ($$[H_2CO_3]$$)?

Accepted Answer

$$	ext{pH} = 6.1 + \log \left( \frac{[$$HCO_3$$^-]}{0.03 	imes $$pCO_2$$} ight) $$

Question 16

Which hormone is released by the adrenal cortex and regulates sodium retention in the kidneys?

Accepted Answer

Aldosterone

Question 17

If all three cone populations in the retina are stimulated equally, what color is perceived?

Accepted Answer

White

Question 18

Which structure connects the middle ear to the nasopharynx, allowing for pressure equalization?

Accepted Answer

Eustachian tube

Question 19

Which equation best describes the cardiac output ($$CO) of $$the heart, given heart rate ($$HR) $$and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV $$

Question 20

Which part of the ear is primarily responsible for maintaining equilibrium and balance?

Accepted Answer

Vestibular apparatus (including semicircular canals and otolith organs)

Anatomy & Physiology: Special Senses, Endocrine System, Blood, and Heart – Guided Study Review

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