Lesson 3 | The Endocrine System



Name Date Class

LESSON 3

The Endocrine System

Directions: In this word search puzzle, find and circle the four terms listed below. Then put the terms that match each definition on the lines provided.

|endocrine system |hormone |negative feedback |positive feedback |

1. The type of feedback system used with Oxytocin during childbirth: _______________

2. The type of feedback system where hormones are only released when needed : ___________________

3. The body system responsible for releasing hormones into the blood: ___________________________________

4. The chemical signals released by endocrine cells:

48 Control and Coordination

Name Date Class

LESSON 3

The Endocrine System

Key Concept What does the endocrine system do?

Directions: Use the terms below to complete the following paragraphs. Each term is used only once.

|body |cells |chemical |effects |endocrine |glands |

|growth |hormones |nervous |organs |tissues | |

The (1.) system consists of various

(2.) and (3.) , called

(4.) , that release (5.) messages

into the body. These molecules are called (6.) .

This system operates less rapidly than the (7.) system.

The messages take more time to go from one part of the (8.) to

another, and they usually produce more gradual (9.) , such as

stimulating (10.) . In addition, the messages usually affect

many more (11.) .

54 Control and Coordination

Name Date Class

LESSON 3

The Endocrine System

Key Concept What does the endocrine system do?

Directions: On the line before each definition, write the letter of the term that matches it correctly. Each

term is used only once.

1. controls the body’s energy use

2. controls the pituitary gland

3. releases testosterone and produces sperm cells

4. secretes insulin and glucagon

5. releases estrogen and produces egg cells

6. regulates calcium release

7. secretes growth hormone and controls other

endocrine glands

8. releases stress-response hormones

9. stimulates the immune system

A. pancreas

B. hypothalamus

C. thymus gland

D. parathyroid glands

E. testes

F. pituitary gland

G. adrenal glands

H. ovaries

I. thyroid gland

56 Control and Coordination

Name Date Class

LESSON 3

The Endocrine System

Key Concept How does the endocrine system interact with other body systems?

Directions: Circle the term in parentheses that correctly completes each sentence.

1. The body can respond to a (stimulus/reaction) through the nervous system and

through the endocrine system.

2. Glands help maintain homeostasis by releasing (cells/hormones) that regulate

internal conditions.

3. Negative feedback systems are comparable to a (thermostat/furnace) in a house.

4. In a negative feedback system, the effect of a hormone (stimulates/inhibits) further

release of the hormone.

5. In a positive feedback system, the effect of a hormone causes (more/less) of the

hormone to be released.

6. Hormone release during childbirth is an example of (positive/negative) feedback.

Control and Coordination 57

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