Neural Control and Coordination

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

Parkinson's disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control and make use of neurotransmitter

1. acetylcholine
2. norepinephrine
3. dopamine
4. GABA

Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cells of the following. Which of the cells are least likely to be replaced by new cells -

1. Malpighian layer of the skin
2. Osteocytes
3. Neurons
4. Liver cells