Question

1. what is a trephine used to remove?

∘ bone
∘ blood
∘ muscle
∘ skin

1. what nerve in the eye carries visual impulses from the retina to the brain?

∘ trochlear
∘ optic
∘ oculomotor
∘ olfactory

Explanation:

Question 73

A trephine is a surgical instrument used to remove a circular piece of bone, often in procedures related to the skull or other bones. Blood is removed by instruments like syringes or suction devices, muscle by different surgical tools for excision, and skin by tools like dermatomes or scalpels. So the correct option is Bone.

The optic nerve is responsible for carrying visual impulses from the retina (where light is converted to neural signals) to the brain for processing. The trochlear nerve controls eye movement, the oculomotor nerve also controls eye movements and pupil functions, and the olfactory nerve is related to the sense of smell, not vision. So the correct option is optic.

Answer:

A. Bone

Question 74