Advertisements
Advertisements
Questions
Define the following:
Reflex action
Define the following term:
Reflex action
Define reflex action.
Advertisements
Solution
Reflex action is an automatic/quick/immediate, involuntary action in the body brought about by a stimulus. This mechanism prevents injury to the body by triggering a rapid and automatic response.
APPEARS IN
RELATED QUESTIONS
Which part of the brain maintains posture and equilibrium of the body?
Which of the following is not a natural reflex action?
A. Knee-jerk
B. Blinking of eyes due to strong light
C. Salivation at the sight of food
D. Sneezing when any irritant enters the nose
Our ______ system allows us to react to our surroundings. Information from receptors passes along ______ neurons to our brain. Our brain sends impulses along ______ neurons to our muscles.
The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose
what do we refer to in the nervous system when we say:
Natural and conditioned …………………
List in tabular form three distinguishing features between cerebrum and cerebellum.
A change in the environment that causes an animal to react is called ______.
Categorise the following under stimulus and response.
Withdrawal of hand on touching a hot plate
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sneezing
The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the following questions.
![]() |
- Name the phenomenon shown in the figure and define the same.
- Identify the parts labelled as 1 and 2. Write one functional difference between these two.
- Name the bony protective covering and the membranous protective covering of the spinal cord.
- Label the guidelines 3 and 4.
- How is the labelled part 3 different from part 4 with respect to its composition (part of neuron)?
- Give the technical term for the point of contact between the two nerve cells.
- Name the fluid filled inside the central canal of spinal cord.
- Name the term used for a small gap between two neurons.
- Give one example of a neurotransmitter.
- Draw a neat diagram of a nerve cell and label the parts: Perikaryon, Node of Ranvier, Myelin sheath and Axon terminals.

