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प्रश्न
Distinguish between the following pair of words:
Adrenalin and acetylcholine
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उत्तर
| Adrenalin | Acetylcholine |
| It is a neurotransmitter which increases the heart beat to meet any emergency . | It is a neurotransmitter which slows down the heart beat . |
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संबंधित प्रश्न
What is a synapse?
Fill in the blank:
Outer protective layer of skin, called epidermis is made up of ________ tissue.
Name the following:
Five sense organs of human beings and the sensation perceived by each one.
Given alongside is the diagram of a neuron. Name the parts numbered 1-5.
- ............................................................................................... .
- ............................................................................................... .
- ............................................................................................... .
- ............................................................................................... .
- ............................................................................................... .
State whether the following statement is true (T) or false (F):
The largest part of the brain is the cerebrum.
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’.
| Column I | Column II | ||
| (i) | Auditory canal | (a) | Channels pressure waves of air into the middle ear. |
| (ii) | Auditory (Eustachian tube) | (b) | Collects pressure waves of air. |
| (iii) | Auditory nerve | (c) | Converts pressure waves of air into vibrations of bone. |
| (iv) | Incus | (d) | Dissipates sound waves. |
| (v) | Malleus | (e) | Equalizes pressure between the middle ear and the atmosphere. |
| (vi) | Oval window | (f) | Provide information about the spatial orientation of the head. |
| (vii) | Pinna | (g) | Transfers vibrations from a bone to a fluid. |
| (viii) | Round window | (h) | Transfers vibrations from a bone to a membrane. |
| (ix) | Semi-circular canal | (i) | Transfers vibrations from a bone to a bone. |
| (x) | Stapes | (j) | Transfers vibrations from a membrane to a bone. |
| (xi) | Tympanic membrane | (k) | Transmits action potential to the auditory cortex. |
Short answer question
Give a reason - Injury to medulla oblongata may prove fatal.
Explain the following in short.
What is a ganglion?
Name the hormone secreted by Pars intermedia in lower vertebrates.
Identify the lobe which has centre for visual functions.
