COORDINATION

Question 1

VASODILATION

Answer 1

1)muscles in the arteriole walls RELAX, and arterioles DILATE
2) increases supply of blood flow to the surface of the SKIN
3) increases heat loss via radiation to the surroundings

Question 2

VASOCONSTRICTION

Answer 2

1) muscles in the arteriole walls CONTRACT, arterioles constrict, lumen narrows
2) decreases the supply of blood to the surface of the skin
3) reducing heat loss via RADIATION

Question 3

PUPIL REFLEX: BRIGHT

Answer 3

1) BRIGHT light
2) RADIAL muscles of IRIS RELAX
3) CIRCULAR MUSCLES of IRIS CONTRACT
4) pupil constricts to prevent damage to the retina

Question 4

PUPIL ACCOMODATION: DARK

Answer 4

1) DARK:
2) Radial muscles of the IRIS CONTRACT
3) CIRCULAR muscles of the iris RELAX
4) PUPIL DILATES to allow more light in

Question 5

IRIS ACCOMODATION: CLOSE

Answer 5

1) CLOSE
2) CILIARY MUSCLES CONTRACT
3) suspensions ligaments slacken
4) lens is more rounded/ convex
5) more light is refracted onto the retina

Question 6

IRIS ACCOMODATION: DISTANT

Answer 6

1) DISTANT
2) CILIARY MUSCLES RELAX
3) SUSPENSORY LIGAMENTS TIGHTEN
4) pulls on the lens + makes it thinner
5) less light is refracted onto the whiteboard

Question 7

SYNAPSES

Answer 7

1an electrical impulse travels down the axon of the PRE-SYNAPTIC NEURONE, and arrives at the end
2) triggers the release of NEUROTRANSMITTERS across the SYNAPTIC CLEFT, from the VESICLES
3) these diffuse across and bind with RECPETOR MOLECULES on the POST-SYNAPTIC MEMBRANE
4) this triggers the impulse to be generated along the second axon
5) the neurotransmitters are lastly broken down by enzymes to prevent repeated impulses