Edexcel A Biology - Topic 8 (Grey Matter) - Nervous System - Eyes

Receptor of the eye - reflex arc

Retina

1 of 5

sensory neuron in the eye

Optic nerve

2 of 5

type of muscle in iris - contracts in response to darkness -> pupils largen; sympathetic response

Radial muscle

3 of 5

type of muscle in iris - contracts in response to light -> pupils shrink to protect retina; parasympathetic response

Circular muscle

4 of 5

The two muscles in the iris act against each other -> _________ pair

Antagonistic pair

5 of 5

Other cards in this set

sensory neuron in the eye

Optic nerve

type of muscle in iris - contracts in response to darkness -> pupils largen; sympathetic response

type of muscle in iris - contracts in response to light -> pupils shrink to protect retina; parasympathetic response

The two muscles in the iris act against each other -> _________ pair

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