Coordination and Control

Question 1

Label the Diagram:

A =
B =
C =
D =
X =

Answer 1

A = Retina
B = Conjunctiva
C = Cornea
D = Lens
X = Iris

Question 2

Explain the changes in structure as a person moves from a room where the
light is dim to a room where the light is bright.

________ Muscles Contract
______ Muscles relax
So pupil _______

Answer 2

Circular Muscles Contract
Radial Muscles relax
So pupil narrows

Question 3

Explain the changes in structure as a person moves from a room where the
light is bright to a room where the light is dim.

________ Muscles Relax
______ Muscles contract
So pupil _______

Answer 3

Circular Muscles Relax
Radial Muscles contract
So pupil dilates

Question 4

Give the name of one part of the CNS

Answer 4

Brain or Spinal Cord

Question 5

If an animal steps on a sharp object, a reflex arc occurs so that it picks up its
foot to prevent further damage. Describe how named neurons bring about a withdrawal reflex to protect the
animal from damage

________ detects sharp ______
_______ moves along _______ neuron to ___
Via chemical _________ of _________________ across ________
To the _____ neuron and then the ______
Causing ______ to ________

Answer 5

Receptor detects sharp object
Impulse moves along sensory neuron to CNS
Via chemical diffusion of neurotransmitters across synapses
To the motor neuron and then the muscle
Causing muscle to contract

Question 6

Why is the skin described as an organ

Answer 6

Contains several groups of tissues

Question 7

Explain how the skin capillaries regulate body temperature when the body
temperature increases

__________ _____ flow to ____ _______
Because ____________ occurs
Causing blood ______ to _____

Answer 7

Increased blood flow to skin surface
Because vasodilation occurs
Causing blood vessel to widen

Question 8

Some people have suggested that drinking warm drinks may cool the body
because it increases the rate of sweat production.
Design an investigation to determine whether drinking warm drinks increases
the rate of sweat production.
Include experimental details in your answer and write in full sentences

Control the drinks ____________ - have one ___ drink and one ____ drink
Have same ______ of the same ___ and fitness
______ experiment __ times on ____ drink
Measure ____ of _____ of person __ ____ after drinking either drink
Make sure each experiment and drink has the same ______ of drink
Ensure same room ___________ and ________

Answer 8

Control the drinks temperatures - have one hot drink and one cold drink
Have same people of the same age and fitness
Repeat experiment 10 times on each drink
Measure mass of sweat of person 30 mins after drinking either drink
Make sure each experiment and drink has the same volume of drink
Ensure same room temperature and humidity

Question 9

Explain what happens when a person focuses on an object far away

Answer 9

Ciliary Muscles relax
Suspensory ligaments are pulled tight
Lens pulled thin less convex shape
Less refraction of light

Question 10

Explain what happens when a person focuses on an object far away

Answer 10

Ciliary muscles contract
Suspensory ligaments slack
Lens not stretched becomes thicker more convex shape
More refraction of light