Question 1

Which of the following best describes the primary difference between the nervous system and the endocrine system in terms of their signaling mechanisms?

Accepted Answer

The nervous system uses electrical impulses and neurotransmitters for rapid, short-term communication, while the endocrine system uses hormones for slower, long-lasting effects.

Question 2

A paracrine cell releases chemical messengers that:

Accepted Answer

Act locally on nearby cells without entering the bloodstream.

Question 3

Which of the following is NOT a primary endocrine organ?

Accepted Answer

Heart

Question 4

Steroid hormones are characterized by which of the following properties?

Accepted Answer

They are derived from cholesterol and can pass through cell membranes to bind to intracellular receptors.

Question 5

An increase in hormone secretion is an example of:

Accepted Answer

Hypersecretion

Question 6

Insulin is released from the pancreas in response to:

Accepted Answer

High blood glucose levels, causing a decrease in blood glucose.

Question 7

Which hormone is released by the pancreas to increase blood glucose levels, and what is its primary action?

Accepted Answer

Glucagon; stimulates the breakdown of glycogen in the liver.

Question 8

The pituitary gland is located in close proximity to the hypothalamus. What is the significance of this relationship?

Accepted Answer

The hypothalamus directly controls the release of hormones from the pituitary gland.

Question 9

Which hormone is released by the anterior pituitary and stimulates the thyroid gland?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 10

Which hormone is released by the posterior pituitary and is responsible for water reabsorption in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 11

Which hormone is released by the hypothalamus and stimulates the release of adrenocorticotropic hormone (ACTH) from the anterior pituitary?

Accepted Answer

Corticotropin-releasing hormone (CRH)

Question 12

Which hormone is produced by the thyroid gland and is responsible for regulating metabolic rate?

Accepted Answer

Thyroxine (T4)

Question 13

Hypersecretion of growth hormone during childhood results in which condition?

Accepted Answer

Gigantism

Question 14

Which of the following is NOT a major component of blood?

Accepted Answer

Lymph

Question 15

The hematocrit is defined as:

Accepted Answer

The percentage of red blood cells in blood.

Question 16

Hemoglobin is composed of:

Accepted Answer

Four heme groups and four globin chains.

Question 17

Which leukocyte is primarily responsible for fighting bacterial infections?

Accepted Answer

Neutrophils

Question 18

The process of hemostasis involves which sequence of events?

Accepted Answer

Vasoconstriction, platelet plug formation, coagulation

Question 19

A person with blood type AB can receive blood from which of the following types?

Accepted Answer

All blood types (A, B, AB, O)

Question 20

Hemoglobin is degraded in the liver, producing bilirubin. What happens to bilirubin in the body?

Accepted Answer

It is excreted in bile and eventually eliminated in feces.

Exam 1 Study Guide – Endocrine System, Blood, and Hormones

Study Guide - Practice Questions

Study Guide - Flashcards