Q: Which of the following is the correct formula for calculating hematocrit ($$Hct$$), the percentage of red blood cells in a blood sample?

$$Hct = \frac{\text{Volume of RBCs}}{\text{Total Blood Volume}} \times 100$$

Question 1

Which of the following best explains how steroid hormones typically exert their effects on target cells?

Accepted Answer

They directly activate genes by binding to intracellular receptors, leading to protein synthesis.

Question 2

A patient presents with symptoms of hyperthyroidism. Which of the following microscopic findings would most likely be observed in their thyroid tissue?

Accepted Answer

Hyperplastic follicles with reduced colloid and increased epithelial cell height.

Question 3

Which of the following is a correct sequence of events in the coagulation cascade during hemostasis?

Accepted Answer

Vascular spasm → Platelet plug formation → Fibrin mesh formation

Question 4

A patient with chronic kidney disease develops anemia. Which hormone deficiency is most likely responsible for this condition?

Accepted Answer

Erythropoietin

Question 5

Which of the following best describes the difference between up-regulation and down-regulation of hormone receptors?

Accepted Answer

Up-regulation increases the number of receptors in response to low hormone levels; down-regulation decreases them.

Question 6

A patient receives a transfusion of type A blood but is type B. Which of the following best describes the likely outcome?

Accepted Answer

A transfusion reaction will occur due to anti-A antibodies attacking the transfused RBCs.

Question 7

Which of the following is NOT a function of blood?

Accepted Answer

Producing hormones for the endocrine system

Question 8

Which of the following best explains why blood is classified as a connective tissue?

Accepted Answer

It consists of cells suspended in an extracellular matrix (plasma).

Question 9

Which hormone is produced by the pancreas and lowers blood glucose levels? What is the primary mechanism by which it acts?

Accepted Answer

Insulin; increases cellular uptake of glucose

Question 10

Which of the following best describes the role of the hypothalamus in regulating the anterior pituitary?

Accepted Answer

It secretes releasing and inhibiting hormones into the hypophyseal portal system.

Question 11

A patient is diagnosed with Addison's disease, which is characterized by hyposecretion of adrenal cortex hormones. Which of the following symptoms would most likely be present?

Accepted Answer

Hypotension and weight loss

Question 12

Which of the following is the correct formula for calculating hematocrit ($$Hct$$), the percentage of red blood cells in a blood sample?

Accepted Answer

$$Hct = \frac{	ext{Volume of RBCs}}{	ext{Total Blood Volume}} 	imes 100$$

Question 13

Which of the following best describes the process of hematopoiesis?

Accepted Answer

The formation of blood cells from hematopoietic stem cells in red bone marrow

Question 14

Which of the following is a correct pairing of hormone and its regulatory stimulus?

Accepted Answer

Antidiuretic hormone (ADH); released in response to increased blood osmolarity

Question 15

A patient with a genetic deficiency in clotting factor VIII is most likely to experience which of the following?

Accepted Answer

Impaired coagulation and prolonged bleeding (hemophilia A)

Question 16

Which of the following organs is NOT considered a primary endocrine organ but does produce hormones?

Accepted Answer

Heart

Question 17

Which of the following best describes the effect of a hormone acting via a second messenger system?

Accepted Answer

The hormone binds to a cell surface receptor, activating intracellular signaling cascades.

Question 18

A patient with a thrombus in a deep vein is at risk for which of the following complications if the clot dislodges?

Accepted Answer

Embolism

Question 19

Which of the following white blood cells is primarily responsible for combating parasitic infections and is elevated in allergic reactions?

Accepted Answer

Eosinophils

Question 20

A patient with Cushing's syndrome is likely to exhibit which of the following symptoms due to hypersecretion of cortisol?

Accepted Answer

Muscle wasting and central obesity

Bio 211 Exam 1 Study Guidance: Endocrine System & Blood

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