Which of the examples of homeostasis do NOT require the brain to be involved in the control process?
a. temperature regulation
b. osmoregulation (regulation of the water content of blood)
c. blood glucose concentration regulation
1. b and c only
2. c only
3. a and b only
4. b only
The transmission of nerve impulses at a synapse is unidirectional.
Which of the features of the transmission of nerve impulses given below have a role in maintaining the unidirectional transmission?
1 Exocytosis of neurotransmitter at the presynaptic membrane
2 Neurotransmitter hydrolyzing enzyme found on the postsynaptic membrane
3 Neurotransmitter receptors found on the postsynaptic membrane
4 Sodium gated channels on the postsynaptic membrane
1. 2 and 4 only
2. 1, 2 and 3 only
3. 1, 3 and 4 only
4. 1 and 4 only
List-I | List-II | ||
(a) | Multipolar neuron | (i) | Somatic neural system |
(b) | Bipolar neuron | (ii) | Cerebral cortex |
(c) | Myelinated nerve fibre | (iii) | Retina of Eye |
(d) | Unmyelinated nerve fibre | (iv) | Spinal nerves |
(a) | (b) | (c) | (d) | |
1. | (iii) | (i) | (iv) | (ii) |
2. | (ii) | (iv) | (iii) | (i) |
3. | (ii) | (iii) | (i) | (iv) |
4. | (ii) | (iii) | (iv) | (i) |
Statement A: | Excitable cells called neuroglial cells make up more than one-half the volume of neural tissue in our body. |
Statement B: | The greatest control over the body’s responsiveness to changing conditions is exerted by neural tissue. |