Module 2

Module 2—The Endocrine System

Self-Check

To refresh your memory of the structure and organization of the endocrine system and the hormones that the endocrine glands produce, complete the following questions. Check your work. If you have any questions, discuss them with your teacher before you move on to the rest of this lesson.

SC 7. Maintaining stable conditions in the internal environment of a cell is called

1. positive feedback
2. homeostasis
3. reflex loops
4. tropic control

SC 8. Your body temperature is controlled by

1. negative feedback
2. positive feedback
3. tropic hormones
4. antagonistic hormones

SC 9. The three components of a homeostatic mechanism in the body are

1. a stimulus, a sensor, and a response
2. a receptor, a neural pathway, and a control centre
3. a sensor, a set point, and a response
4. a sensor, an effector, and a control centre

SC 10. Skeletal growth is promoted by a hormone secreted by the

1. adrenal cortex
2. adrenal medulla
3. anterior pituitary
4. posterior pituitary

SC 11. A hormone that regulates glucose levels in the blood and a hormone that regulates sodium ions in the blood, and indirectly regulates water reabsorption by the kidneys, are, respectively,

1. aldosterone and insulin
2. glucagon and aldosterone
3. insulin and antidiuretic hormone
4. epinephrine and antidiuretic hormone

SC 12. During an emergency situation, the adrenal gland is stimulated to release a hormone that directly causes an increase in

1. conversion of glucose to glycogen
2. insulin levels
3. thyroxine levels
4. blood glucose levels

Use the following information to answer question SC 13.

SC 13. Possible symptoms of phenochromocytoma include

1. increased heart rate, increased blood glucose, increased metabolic rate
2. decreased heart rate, increased blood glucose, increased metabolic rate
3. increased heart rate, decreased blood glucose, decreased metabolic rate
4. decreased heart rate, decreased blood glucose, decreased metabolic rate

SC 14. The release of milk from the breast after the birth of a baby is related to increased levels of

1. estrogen
2. progesterone
3. oxytocin
4. FSH and LH

True-or-False Questions

Identify each of the statements below as being true or false. If you think that the statement is false, change the statement to make it true.

SC 15. The main purpose of the endocrine system is for the protection of the body.

SC 16. Hormones are released into the bloodstream.

SC 17. Adrenocorticotropic hormone is released by the adrenal glands to control the pituitary gland.

SC 18. Positive feedback leads to instability of the internal environment.

SC 19. The anterior pituitary releases tropic hormones that were produced by the hypothalamus and stored.