Intro to nervous system

Question 1

Internal/ external

Answer 1

Internal environment: blood glucose temp, internal temp, water potential, cell pH.
External: humidity, external temperature, light intensity, new/ sudden sound.

Question 2

Why is coordination needed?

Answer 2

-Perform specific functions
-Few body systems can work in isolation

Question 3

Cell signalling

Answer 3

• hormonal systems coordinate at a cellular level which relies on communication at a cellular level (between synapses)

Question 4

Homeostasis

Answer 4

The maintenance of relatively constant conditions inside a body.

Question 5

Nervous system

Answer 5

Fast, short lived and localised

Question 6

Divided into:

Answer 6

CNS- brain and spinal cord contain relay neurones
PNS- all nerve cells

Question 7

Peripheral nervous system split into:

Answer 7

Somatic- conscious activities
Autonomic- unconscious activities.

Question 8

Autonomic further split into:

Answer 8

Parasympathetic- calms nervous system- release of acetylcholine
Sympathetic- F or F system releases noradrenaline.

Question 9

What are neurones?

Answer 9

Specialised cells that conduct electrical impulses within the nervous system.

Question 10

Which neuron is the CNS mainly made of?

Answer 10

relay neurons.

Question 11

What do sensory receptors act as?

Answer 11

Transducers- they convert the energy of a stimulus into electrical energy.