Draw a labelled diagram of a myelinated neuron.
Important Questions on The Nervous System
Write one word for the following:
The structural and functional unit of the nervous system.
Write one word for the following.
A bundle of axons enclosed in a tubular sheath.
Given below is a common reflex in humans. Classify it as a simple reflex or conditioned reflex.
Watering of mouth on seeing a favourite dish.
Given below is a common reflex in humans. Classify it as a simple reflex or conditioned reflex.
Closing of eyelids if a strong beam of light is flashed across.
Given below are a few situations. What effective change will occur in the organ/body part mentioned and which part (sympathetic or parasympathetic) of the autonomic nervous system brings it about?
| Situation | Organ/body part | Change/action | Part of the autonomic nervous system involved |
| 1. You have entered a dark room. | Eye | ||
| 2. Your body is consuming more glucose while running a race. | Liver | ||
| 3. You are chewing tasty food. | Salivary gland | ||
| 4. You are running a race. | Adrenal gland | ||
| 5. You are retiring to bed for sleep. | Heart | ||
| 6. You are shivering in intense cold. | Body hairs |
Given below is the partially incomplete scheme of the components of the peripheral nervous system. Fill up the blanks numbered (1)-(12) :
