Nervous and Endocrine Systems

Question 1

What is the Nervous System?

Answer 1

Sends electrical impulses along neurons.

• The message is transmitted to target cells by neurotransmitters.
• The response to stimuliis near instantaneous.

Question 2

What is the Endocrine System?

Answer 2

Regulates long-term processes such as growth, development, reproduction, metabolism.

• Uses hormones to relay information and instructions between cells.
• Regulated by negative feedback.
• Maintains homeostasis.

Question 3

Three General Features of the Endocrine System?

Answer 3

Ductless (gland that secretes directly into the bloodstream)

Rich supply of blood

Hormones, produced by the endocrine glands are secreted into the bloodstream.

Question 4

The Hypothalamus and Endocrine System

Answer 4

‘1.50-6.20’

https://www.youtube.com/watch?v=eWHH9je2zG4

Question 5

How is the Endocrine System controlled?

Answer 5

Controlled by negative feedback, Stimulus triggers the production of a hormone that acts to reduce the intensity of the stimulus.

Question 6

Insulin & Glucagon

Answer 6

‘6.22 - 10.00’

https://www.youtube.com/watch?v=Id2E72P8Fe0&t=613s

Question 7

Testosterone (Fact Card)

Answer 7

Crosses cell membrane.

Bind to receptors and activates or deactivates specific genes.

Targets cells causing metabolic activity

Alters rate of DNA transcription in nucleus, changing patterns of protein synthesis.

Question 8

What is Stress and what are three ways the adapts to it?

Answer 8

Stress is any condition that threatens homeostasis

General Adaptation Syndrome to stress -

– Alarm phase (fight or flight)
– Resistance phase (glucocorticoid response)
– Exhaustion phase (organ system failure)