endocrine system

Question 1

What is the endocrine system?

Answer 1

Works with nervous system to control functions

Slower than NS but more powerful and widespread

Question 2

What is a gland?

Answer 2

Produces hormones

Question 3

What is a hormone?

Answer 3

Secreted into blood to affect cells with receptors for that hormone

Question 4

What is thyroxine?

Answer 4

Produced by thyroid gland
Affects cells in heart increasing heart rate
Increases metabolic rate = affects growth rate

Question 5

What is the major endocrine gland?

Answer 5

Pituitary gland
In brain
Master gland - controls release of hormones from other glands

Question 6

How does the fight or flight response work?

Answer 6

Stressor perceived - hypothalamus triggers activity in sympathetic branch of ANS
Changes from parasympathetic state to sympathetic state
Stress hormone adrenaline released from adrenal medulla - creates arousal needed
Parasympathetic NS returns body to resting state

Question 7

What is the rest and digest response?

Answer 7

Body in resting state
Parasympathetic is antagonistic to sympathetic
Reduces activities increased by sympathetic branch

Question 8

What are the biological changes associated with the sympathetic state?

Answer 8

Increased heart and breathing rate
Pupil dilation
Inhibited digestion
Inhibited saliva production
Contracted rectum