Answer to Question #192923 in Human Anatomy and Physiology for Jone

Question

Good day, lease select all correct options, thanks

The sensation of taste:

A) includes five basic tastes.

B) is abolished if the facial (VIIth cranial) nerve is damaged.

C) is perceived in the lateral geniculate nucleus.

D) is relayed by the vagus (Xth cranial) nerve.

E) of sour occurs when taste buds are stimulated by H+. 

Answer 1

Answers:

Options A, B, D and E are correct while C is incorrect;

A) The sensation of taste includes five basic tastes i.e. sweetness, sourness, saltiness, bitterness and savoriness (or umami).

B) The sensation of taste is abolished if the facial (VII^th cranial) nerve is damaged since it (the Facial Nerve) transmits encoded taste information away from the anterior two-thirds of the tongue in a branch called the chorda tympani to the brain, therefore its damage can cause loss of taste, a condition referred to as ageusia.

C) The sensation of taste is not perceived in the lateral geniculate nucleus; The lateral geniculate nucleus (LGN; also called the lateral geniculate body or lateral geniculate complex) is a relay center in the thalamus for the visual pathway. It is a small, ovoid, ventral projection of the thalamus where the thalamus connects with the optic nerve in the eye.

D)The sensation of tastes is relayed by the vagus (X^th cranial) nerve; it carries afferent fibres from the root of the tongue and epiglottis to the brain for the purpose of transmitting taste signals.

E) The sensation of taste of sour occurs when taste buds are stimulated by H⁺; hydrogen ions (H⁺) bind to acid sensing channels in the membrane of taste cells (buds), when the channels become activated, they cause the nerves to send signal.