121.

Which one of the following is NOT involved with the absorption of iron in the intestine?

• Divalent metal transporter

• Ferroportin

• Hephaestin

• Transferrin

In which one of the body fluids is K⁺ concentration higher than that of Na⁺?

• Plasma

• Perilymph

• Endolymph

• Cerebrospinal fluid

Mammillary bodies are present in

• thalamus

• epithalamus

• hypothalamus

• midbrain

Reflex ovulation does NOT occur in

• cats

• rabbits

• mink

• rats

Sympathetic post-ganglionic neurons that are cholinergic, innervate ?

• Sweat glands

• parotid glands

• hair follicle

• Pancrease

Two individuals A and B, each of 75 kg body weight, have similar volume of body water. Both of them had high salt snack. However, individual A also had a glass of alcoholic drink. Based on this information, which one of the following statements is true?

• A will have lower circulating level of antidiuretic hormone (ADH) than B 

• B will have lower circulating level of ADH than A

• The level of ADH will not change in these two individuals 

• The reabsorption of water in kidney will be more in A than B

The different waves of normal electrocardiogram (ECG) of a human subject are shown below: The relationship of the events of cardiac cycle to these ECG waves are proposed in the following statements:

(a) The P wave occurs due to the depolarization of atria

(b) The atrial repolarization is responsible for the T wave

(c) The QRS complex occurs during ventricular depolarization

(d) Q-T interval indicates plateau portion of auricular action potential

Select the combination with INCORRECT statements from the following options:

• (a) and (b)

• (b) and (c)

• (c) and (d)

• (b) and (d)

The excitation of auditory hair cells by the displacement of stereocilia has been explained in the following proposed statements:

(a) The gradual increased height of stereocilia is required for the transduction process

(b) The changes of membrane potential of auditory hair cells are proportional to the direction and magnitude of the displacement of stereocilia

(c) The higher concentration of K⁺ in endolymph and higher concentration of Na⁺ in perilymph are not required for the excitation of hair cells.

(d) The mechanically sensitive cation channels on the top of stereocilia are not adapted to maintain displacement of stereocilia

Select the combination with INCORRECT statements from the following options: 

• (a) and (b)

• (b) and (c)

• (c) and (d)

• (a) and (c) 

The peaks of the compound action potential (i.e., A, B and C) recorded from a mammalian mixed nerve were affected after application of increasing pressure on the nerve. Some probable changes of compound action are stated below:

(a) ‘A’ peak was inhibited by lower intensity of pressure

(b) ‘C’ peak was inhibited by higher intensity of pressure

(c) ‘B’ peak was inhibited by lower intensity of pressure

(d) ‘C’ peak was inhibited by lower intensity of pressure

(e) ‘A’ peak was inhibited by higher intensity of pressure

Select the option with the combination of CORRECT statements. 

• (a) and (b)

• (b) and (c)

• (c) and (d)

• (d) and (e)

The figure below represents normal sex determination, differentiation and development in humans.

Identify A, B, C and D.

• A = WT1 (Wilm’s Tumor 1),B = MIS (Mullerian Inhibitory Substance), C = SRY, D = Testosterone

• A = GnRH, B = FSH, C = Testosterone, D = 5α Reductase

• A = SRY, B = MIS, C = Testosterone, D = DHT (Dihydrotestosterone) 

• A = WT1, B = LH, C = ABP (Androgen Binding Protein), D = Inhibin