Question

Equilibrium receptor regions in the vestibule are called _________ and they monitor ________movements.

A)cristae ampullares; rotational

B)otolithic membranes; static equilibrium

C)maculae; linear acceleration

D)semicircular canals; rotational and spinning

The structure that controls the amount of light entering the eye is the ________, whereas the structure that controls the shape of the lens to focus that light is the _________.

pupil; extrinsic eye muscles

cornea; choroid

fovea centralis; retina

iris; ciliary muscle

A patient with stroke damage to the right visual cortex will have vision loss in the _______. only the far right part of the visual field entire right half of the visual field only the far left part of the visual field entire left half of the visual field

The tiny middle ear muscles that dampen movement of the ossicles are skeletal muscle, however, their actions are not under voluntary control. This is because _______.

1. they are controlled directly by sounds, and not the nervous system
2. they are controlled by the autonomic nervous system, which is automatic.
3. they are controlled by somatic reflex loops that are activated by very loud sounds.
4. they are controlled by the ossicles in a positive feedback manner

The impulses originating in the retina travel to the _______ of the _______ lobe, which allows perception and conscious awareness of visual input.

primary visual cortex; temporal

primary somatosensory cortex; parietal

primary motor cortex; frontal lobe

primary visual cortex; occipital

Answer 1

1. Option C is the correct answer. The vestibule of the inner ear also encodes information about equilibrium in addition to audition. The vestibule has three regions utricle, saccule and semicircular canals. Utricle and saccule sense the head position whereas head linear movement is sensed by semicircular canals. These regions form receptor equilibrium region which are largely composed of macula tissue.

2. Option A is the correct answer. The amount of light entering the eye is controlled by pupil which is an adjustable circular opening in the iris. The extrinsic eye muscles like superior rectus muscle, inferior rectus muscle etc. controls the shape of the lens to focus that light.

3. Option C is the correct answer. The tympanic reflex is initiated by very loud sound. The tympanic reflex involves the contraction of two small muscles in the middle ear which dampen sound transmission and protect the fragile cochlear mechanism.

4. Option D is the correct answer. The impulses originating in the retina travel to the primary visual cortex via visual pathway which consist of retina, optic nerves, optic chiasm, optic tracts, lateral geniculate bodies, optic radiations, and visual cortex. The primary visual cortex is located at the back of the brain in the occipital lobe.