Neural Control and Coordination · Question 39

During the propagation of a nerve impulse, the action potential results from the movement of

1. K+ ions from intracellular fluid to extracellular fluid
2. Na+ ions from extracellular fluid to intracellular fluid
3. K+ ions from extracellular fluid to intracellular fluid
4. Na+ ions from intracellular fluid to extracellular fluid

Given below is a diagrammatic cross section of a single loop of human cochlea. [Figure] Which one of the following options correctly represents the names of three different parts?

1. B : Tectorial membrane, C : Perilymph, D : Secretory cells
2. A : Perilymph, B : Tectorial membrane, C : Endolymph
3. C : Endolymph, D : Sensory hair cells, A : Serum
4. D : Sensory hair cells, A : Endolymph, B : Tectorial membrane

Cornea transplant in humans is almost never rejected. This is because

1. it is composed of enucleated cells
2. it is a non-living layer
3. its cells are least penetrable by bacteria
4. it has no blood supply

Which one of the following is the correct difference between rod cells and cone cells of our retina?

1. array|l|l|l| & Rod cells & Cone cells \ Overall function & Vision in poor light & Colour vision and detailed vision in bright light \ array
2. array|l|l|l| & Rod cells & Cone cells \ Distribution & More concentrated in centre of retina & Evenly distributed all over retina \ array
3. array|l|l|l| & Rod cells & Cone cells \ Visual acuity & High & Low \ array
4. array|l|l|l| & Rod cells & Cone cells \ Visual pigment contained & Iodopsin & Rhodopsin \ array

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change?

1. First positive, then negative and continue to be negative
2. First negative, then positive and continue to be positive
3. First positive, then negative and again back to positive
4. First negative, then positive and again back to negative

Bowman's glands are located in the

1. Anterior pituitary
2. Female reproductive system of cockroach
3. Olfactory epithelium of our nose
4. Proximal end of uriniferous tubules

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?

1. Perikaryon and dendrites
2. Nucleus and mitochondria
3. Flagellum and medullary sheath
4. Vacuoles and fibres

Which one of the following does not act as a neurotransmitter?

1. Cortisone
2. Acetylcholine
3. Epinephrine
4. Norepinephrine

Which one of the following is an example of the action of the autonomic nervous system?

1. Swallowing of food
2. Pupillary reflex
3. Peristalsis of the intestine
4. Knee-jerk response

In a man, abducens nerve is injured. Which one of the following functions will be affected?

1. Movement of the eyeball
2. Movement of the tongue
3. Swallowing
4. Movement of the neck