Chapter 10

Question 1

Define Homeostasis

Answer 1

Homeostasis is the regulation of internal conditions of a cell or organism to maintain optimum conditions for function

Question 2

What’s in the CNS

Answer 2

brain and spinal cord

Question 3

Differences between Nervous System and Hormone System

Answer 3

nervous system
quicker, shorter and more specific reactions
hormone system
longer lasting, longer reaction time and operates in a larger area

Question 4

Draw a sensory neurone versus a motor neurone

Answer 4

sensory neurone has a cell body half way down the neurone

motor neurone has a cell body at the end of the neurone

Question 5

Reflex Arc Pathway

Answer 5

stimulus => receptor => sensory neurone => synapse => CNS => motor neurone => effector

Question 6

What happens at a synapse

Answer 6

Synapses are tiny regions of empty space through which nerve cells are able to transmit information to other cells. This occurs when a nerve impulse reaches the terminal point of a neuron, stimulating the nerve cell and causing the release of neurotransmitter molecules

Question 7

Give 3 examples of new technology for the eye

Answer 7

contact lenses

• instead of glasses - more practical
• :( can cause eye infection

laser eye surgery

• myopia - you reduce thickness of cornea so it refracts less
• hyperopia - change curve of cornea so it refracts more

replacement lenses

• add or replace with another lens
• :( damage retina // if you leave the natural one there, it could get infected + you can develop cataracts

Question 8

What changes happen in eye when you look at something close

Answer 8

ciliary muscles contract

suspensory ligaments relax

Question 9

What is accommodation

Answer 9

the process of changing the shape of the lens of the eye to focus on near or distant objects.

Question 10

What changes happen in eye when you look at something distant

Answer 10

suspensory ligaments contract

ciliary muscles relax

Question 11

What happens to eye if light intensity is high

Answer 11

radial muscles relax

circular muscles contract

Question 12

What happens to eye if light intensity is low

Answer 12

radial muscles contract

circular muscles relax

Question 13

label eye

Answer 13

lens, cornea, pupil, iris, suspensory ligament, ciliary muscle, retina, sclera, optic nerve

Question 14

where is a) cerebellum b) cerebral Cortex c) medulla

Answer 14

a) back of head
b) top of head
c) infront of cerebellum

Question 15

what does the medulla do

Answer 15

controls unconscious activities

Question 16

what does the cerebral cortex do

Answer 16

consciousness, intelligence, memory, language

Question 17

what does the cerebellum do

Answer 17

coordinating muscular activity