Neurons

Question 1

What is homeostasis

Answer 1

Maintainence of internal environment in a range through negative feedback

Question 2

What is the nervous pathway

Answer 2

Receptor receives stimulus -> sensory neurone -> CNS which has relay neurons -> motor neurone -> effector (muscles or glands)

Question 3

What are the general structures of a neurone

Answer 3

Dendron - sends impulse to cell body
Cell body - releases neurotransmitters
Axon - sends impulses away from cell body
Myelin sheath - layers of plasma membranes (lipids) speeds up nervous transmission

Question 4

Sensory neurone structure

Answer 4

Dendrites to receive impulse from receptors which pass along the dendron to the cell body. After they get sent along axon and into the axon terminals. Blud also has myelin sheath. Impulse jumps along nodes of ranvier

Question 5

Structur motor neurone

Answer 5

Cell body is at the beginning of the neurone with dendrites coming out. Dendrites receive impulses from relay in to the cell body, where it goes through the axon which branches off into axon terminals. It also has myelin sheath and nodes of Ranvier

Question 6

Relay neurone structure

Answer 6

Cell body in middle - dendrites on one side of cell body, axons on the other side of the cell body which relays signal to motor neurone

Question 7

Structure and function of myelin sheath

Answer 7

Layers of lipids that insulates axon, speeding up nerve impulse transmission - when it travels from one node to smother is saltatory conduction. It’s also made up of Schwann cells