Topic 7: Endocrine System - Regulation of Hormone Secretion into Blood

Question 1

Stimuli acting on an endocrine gland may be ___, ___ or ___.

Answer 1

• Humoral
• Neural
• Hormonal

Question 2

What is the stimulus in for a Humoral stimulus? (2)

Answer 2

ions or nutrients

Question 3

How is increased blood glucose an example of a humoral stimulus? (2)

Answer 3

1. blood glucose increases after eating carbs
2. Pancreatic B-cells (of Islets of Langerhans) detect glucose and release insulin to decrease blood glucose
   - i guess the stimulus is glucose (nutrients)

Question 4

How is decreased blood calcium a humoral stimulus? (4)

Answer 4

1. decreased blood calcium
2. Parathyroid glands detect decreased calcium and released PTH
3. This increases bone resorption (breakdown) by decreasing osteoblast activity and increasing osteoclast activity
4. increased blood calcium

Question 5

What are 2 examples of neural stimuli?

Answer 5

1. Heart Rate
2. Uterine contractions

Question 6

Neural Stimulus Heart rate diagram

Answer 6

Question 7

Neural Stimulus Uterine contraction diagram

Answer 7

Question 8

Metabolism is a HORMONAL stimulus. Diagram is shown

Answer 8