Quiz 35: Endocrine Control

Biology

Naturally occurring vegetables like broccoli, brussels sprouts and vegetables have bitter taste but are very rich in sulphur congaing compounds such as Indole-3-carbinol. The detoxification process in our body needs the sulphur compounds to work efficiently. These sulphur containing compounds help phase 2 detoxification processes, and thus help fight against cancer causing chemicals by eliminating them through this process. Taking these vegetables in diet decreases the risk of getting breast, colon, prostate, uterine cancers etc. People who do not eat these vegetables may have the more chances for the accumulation of toxins, which may gradually accumulate and promote tumour genesis. Thus, as Lionel does not like eat broccoli, and brussels sprouts because of his hypersensitivity towards the bitter taste, he is at the greater risk of developing colon polyps and colon cancer than the people who eat those.

Any stimulus is a form of energy, so when some energy is applied in the form of stimuli, the sensory receptors respond towards the stimuli. Sensory receptors are the modified endings of dendrites. This causes change in membrane potentials of neurons innervating that region, and causes depolarisation , which results in impulse generation and transmission. Thus, the correct option is (a) sensory receptors Nervous tissue contains neurons that are actively involved in signal propagation process in the body. It is the main media of communication between the cells and organs; it is a very complicated network of nerve cells. Thus, the option (b) is incorrect. Brain is the center of integration of received impulses, it works together with the nervous system. Thus, the option (c) is incorrect. Option (d) is stating that all of the above are correct. So, it is incorrect option.

Any stimulus is a form of energy, so when some energy applied in the form of stimuli, this causes change in membrane potentials of neurons innervating that region, and causes depolarisation , which results in impulse generation and transmission. Depend upon the severity of stimuli, the duration of impulse varies. These senses are received by sensory receptors , which are protienious in structure. These receptors transduce the stimuli and send signals to the CNS. All the sensory pathways involves four basic functions namely, sensory reception and transduction, transmission, perception, amplification and adaptation. There are five types of sensory receptors in our body. 1. Mechanoreceptors 2. Chemo receptors 3. Electromagnetic receptors 4. Thermoreceptors 5. Pain receptors. Pythons have thermoreceptors below and above their mouth that can sense heat or infrared energy. These receptors detect the IR radiation emitted by the nearly prey such as a warm mouse, rabbit, rat etc. though it is a meter away from the snake. The snake finds the correct location of the mouse by moving its head from side to side, until both the receptors detect the radiation equally.

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