Xpress Minion test 3

1.

1 point

Regarding organ of Corti, all are true except?

Hensen’s cells lie inside the outer hair cells.

Tectorial membrane is made of glycoprotein

Reticular lamina is supported by rods of Corti.

Efferent cholinergic fibers arise from ipsilateral and contralateral superior olivary nucleus

2.

1 point

Retinal isomerase catalyses the conversion of?

11-cis retinal to rhodopsin

Lumirhodopsin to metarhodopsin.

All trans retinal to 11-cis retinal

Bathorhodopsin to lumirhodopsin

3.

1 point

Most important mechanism which gets triggered in the first few hours after large increase in salt and water intake is

Activation of low pressure receptor reflexes

Suppression of angiotensin II formation

Small increase in arterial pressure

Stimulation of natriuretic systems

4.

1 point

Juxtamedullary nephrons:

Have slow rate of filtration

Possess short loops of Henle

Have smaller sized glomeruli

Both descending and ascending limbs of loop of Henle contain thin segments.

5.

1 point

Regarding somatomedin, which is true?

Reduced glucose oxidation in fat

Activity is increased in protein deficiency

Increases chondrogenesis

Activity is increased by glucocorticoids

6.

1 point

Primary hyperaldosteronism is characterised by?

Rise in plasma potassium

Peripheral oedema

Metabolic acidosis

Decrease in sodium content of sweat

7.

1 point

The function of axonemal dynein is?

Moves particles to the 'minus' end of microtubule.

Moves particles towards 'plus' end of microtubule

Binds to actin and produce motion by bending their neck region.

Responsible for the beating of flagella and cilia.

8.

1 point

Action of calcitonin is?

Increases bone resorption

Increases renal formation of 1-25 DHCC

Increases calcium and phosphate absorption from GIT

Increases renal excretion of calcium and phosphate

9.

1 point

Which is a true statement regarding inhibin?

Molecular weight is between 5000 and 10,000.

It is secreted by hypothalamus.

It is a glycoprotein

Increases the secretion of GnRH.

10.

1 point

Regarding contractile filaments, which is true?

ADP molecules are the active sites on the actin filament.

The strong affinity of tropomyosin for calcium ions initiates the contraction process

The backbone of the actin filament is G-actin molecule.

Each successive pair of cross bridges of myosin filaments is axially displaced from the previous pair by 140 degrees.