Q. No.During the transmission of nerve impulses through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?
1.
First negative, then positive, and again back to negative
2.
First positive, then negative, and continue to be negative
3.
First negative, then positive, and then continues to be positive
4.
First positive, then negative, and again back to positive
Which one of the following is the correct difference between rod cells and cone cells of our retina?
| Features | Rod cells | Cone cells | |
| (a) | Visual acuity | High | Low |
| (b) | Visual pigment contained | Iodopsin | Rhodopsin |
| (c) | Overall function | Vision in poor light | Colour vision and detailed vision in bright light |
| (d) | Distribution | More concentrated in centre of retina | Evenly distributed all over retina |
1. a
2. b
3. c
4. d
Alzheimer disease in humans is associated with the deficiency of:
1. dopamine
2. glutamic acid
3. acetylcholine
4. Gamma Amino Butyric Acid (GABA)
Which part of the human brain is concerned with the regulation of body temperature?
1. Medulla oblongata
2. Cerebellum
3. Cerebrum
4. Hypothalamus
| 1. | Henle’s loop – most reabsorption of the major substances from the glomerular filtrate |
| 2. | Distal convoluted tubule – reabsorption of ions into the surrounding blood capillaries |
| 3. | Afferent arteriole – carries the blood away from the glomerulus towards renal vein |
| 4. | Podocytes - create minute spaces (slit pores) for the filtration of blood into the Bowman’s capsule |
A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neurohormonal control system?
| 1. | Sympathetic nervous system activated releasing epinephrine and norepinephrine from adrenal medulla |
| 2. | Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse |
| 3. | Hypothalamus activates the parasympathetic division of the brain |
| 4. | Sympathetic nervous system is activated releasing epinephrine and norepinephrine from the adrenal cortex |
The human hindbrain comprises three parts, one of which is:
| 1. | Cerebellum | 2. | Hypothalamus |
| 3. | Spinal | 4. | Corpus callosum |
Injury localized to the hypothalamus would most likely disrupt:
1. short-term memory
2. co-ordination during locomotion
3. executive functions, such as decision making
4. regulation of body temperature
A gymnast is able to balance his body upside down even in total darkness because of:
1. cochlea
2. vestibular apparatus
3. tectorial membrane
4. the organ of Corti
Which of the following regions of the brain is incorrectly paired with its function?
| 1. | Medulla oblongata-Homeostatic control |
| 2. | Cerebellum-Language comprehension |
| 3. | Corpus callosum-Communication between the left and right cerebral cortices |
| 4. | Cerebrum-Calculation and contemplation |
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