Nervous System / Neurones/ Endocrine

Question 1

Function of the nervous system

Answer 1

1. Specialised network of cells act as internal communication
2. To collect process and respond to environment
3. To co-ordinate organs and cells
4. Sub-divided into CNS and PNS

Question 2

Describe the CNS

Answer 2

1. Brain and spinal cord
2. Outer layer (cerebral cortex) is highly developed
3. Spinal cord involved in reflex arcs and connects with PNS

Question 3

What is the PNS subdivided into

Answer 3

Autonomic NS: vital, unconscious, bodily functions such as breathing

Somatic NS: muscle movement and sensory receptors

Question 4

Describe the endocrine system

Answer 4

1. Glands and hormones
2. Slower but powerful effect
3. Hormones made and secreted by glands into the bloodstream
4. Pituitary gland is master gland

Question 5

Outline fight or flight

Answer 5

1. Stressor received
2. ANS changes from parasympathetic (resting) state to sympathetic
3. Adrenaline released from adrenal medulla into bloodstream
4. Causes fight or flight
5. Reverse happens when threat has passed

Question 6

Name 3 features of sympathetic state

Answer 6

1. Increases heart rate
2. Increased breathing rate
3. Inhibits digestion

Question 7

Structure of neurones

Answer 7

All: cell body inc nucleus
Dendrites: carry impulse for neighbouring neurones to cell body

Axon: carries away (myelinated) through saltatory conduction

Question 8

Which have long axons

Answer 8

Motor