Question 1

Which hormone is released from the posterior pituitary and is primarily responsible for increasing water reabsorption in the kidneys, thereby reducing urine output?

Accepted Answer

Antidiuretic hormone (ADH)

Question 2

A patient presents with high blood glucose levels. Which hormone, produced by the pancreas, would be secreted to lower blood glucose by promoting cellular uptake of glucose?

Accepted Answer

Insulin

Question 3

Which of the following best describes the difference between steroid (lipid-soluble) hormones and amino acid-based (water-soluble) hormones in terms of their mechanism of action?

Accepted Answer

Steroid hormones bind to intracellular receptors, while amino acid-based hormones typically use second messenger systems such as $$cAMP$$

Question 4

A patient with Addison’s disease has a deficiency in which class of hormones, and what is the primary site of their production?

Accepted Answer

Corticosteroids; adrenal cortex

Question 5

Which hormone is released in response to low blood calcium levels and acts to increase blood calcium by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 6

Which of the following is a correct sequence in the renin-angiotensin-aldosterone (RAA) mechanism leading to increased blood pressure?

Accepted Answer

Renin release $$\rightarrow$$ angiotensin II formation $$\rightarrow$$ aldosterone secretion $$\rightarrow$$ sodium reabsorption

Question 7

Which of the following best describes the role of helper T cells (TH) in the immune response?

Accepted Answer

They activate both B cells and cytotoxic T cells by releasing cytokines

Question 8

A patient is exposed to a novel pathogen. Which line of immune defense is responsible for the initial, nonspecific response?

Accepted Answer

Innate (nonspecific) defense system

Question 9

Which of the following is a function of the spleen in the lymphatic/immune system?

Accepted Answer

It filters blood, removing old red blood cells and pathogens

Question 10

Which hormone is primarily responsible for stimulating the release of thyroid hormones from the thyroid gland?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 11

A patient is diagnosed with an autoimmune disease. Which of the following best describes the underlying problem?

Accepted Answer

The immune system attacks self-antigens, mistaking them for foreign antigens

Question 12

Which of the following best explains the concept of 'up-regulation' in hormone receptors?

Accepted Answer

Target cells increase the number of receptors in response to low hormone levels

Question 13

Which of the following is a correct pairing of hormone and its primary function?

Accepted Answer

Prolactin (PRL): stimulates milk production

Question 14

Which immune cells are responsible for producing antibodies during the humoral immune response?

Accepted Answer

Plasma cells

Question 15

A patient with a tumor in the anterior pituitary is found to have elevated levels of ACTH. Which gland will be most directly affected by this hormone?

Accepted Answer

Adrenal cortex

Question 16

Which of the following best describes the role of MHC proteins in the immune system?

Accepted Answer

They present antigen fragments to T cells for immune recognition

Question 17

Which hormone is secreted by the pineal gland and is involved in regulating circadian rhythms?

Accepted Answer

Melatonin

Question 18

A patient is unable to mount an effective immune response to a specific pathogen after initial exposure, but responds rapidly upon re-exposure. Which cells are primarily responsible for this enhanced secondary response?

Accepted Answer

Memory B and T cells

Question 19

Which of the following best describes the function of the thymus in the immune system?

Accepted Answer

It is the site of T cell maturation and selection

Question 20

Which hormone is released in response to high blood glucose and acts antagonistically to glucagon?

Accepted Answer

Insulin

Endocrine and Lymphatic/Immune Systems: Key Concepts and Terminology

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