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प्रश्न
Define the following:
Reflex arc
उत्तर १
The path that an impulse takes in a reflex action is called a reflex arc.
उत्तर २
The path along which the reflexive impulse travel is called a reflex arc.
(OR)
The pathway taken by nerve impulse to accomplish reflex action is called a reflex arc.
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संबंधित प्रश्न
What is autonomic nervous system? What is its function?
What is a synapse?
How are the messages carried across a synapse? Explain with the help of a labelled diagram.
What does the central nervous system in humans consist of? What is the job of the central nervous system?
In a synapse, chemical signal is transmitted from :
(a) axon to cell body of the same neuron
(b) cell body to axon end of the same neuron
(c) dendrite end of one neuron to axon end of adjacent neuron
(d) axon end of one neuron to dendrite end of adjacent neuron
The human body contains a large number of cells A which are very long and branched, and look like electric wires. The longest branch of this cell is B whereas there are many small branches C. Any two A cells do not join to one another completely in the human body. There is a microscopic gap D between every pair of adjacent A cells through which electric impulses can pass by the release of a chemical substance.
(a) What are cells A?
(b) What is the name of (i) branch B, and (ii) branches C?
(c) What is the microscopic gap D known as?
(d) What is the function of cells like A in the human body?
(e) The cells A are of three types. name the three types.
Explain why the tongue may be considered as both a receptor and an effector organ.
Multiple choice question. Tick (✓) the correct choice:
The brown pigment melanin is present in ____ of skin.
- Epidermis
- Fat cells
- Dermis
- Hair follicles.
Fill in the blank:
The coloured part of eye is called _______.
Fill in the blank:
A neuron consists of ..................... and ...................
Name the following:
Nerve which carry impulse from sensory receptor to CNS.
Name the following:
Outermost meningial membrane of spinal cord.
Define the following:
Action potential
Nervous and hormonal systems together perform the function of control and coordination in human beings. Justify this statement with the help of an example.
Give Reason:
The spinal cord and brain are called the central nervous system.
Explain the Term: Cyton
Explain the Term: Voluntary-action
Explain the Term: Synapse
Give Technical Term:
The find cytoplasmic processes of the cell body of a neuron.
Give Technical Terms:
The number of cranial and spinal nerves in man.
Complete the following sentence with appropriate word :
A bundle of axons enclosed in a tubular sheath is called _________.
The below diagram is the surface of the tongue showing the taste zone.
(i) Label the parts 1-4.
(ii) Where are the receptors for sensations of taste are located?
(iii) Why do people suffering from cold often complain that they cannot taste their food?
State the Location of:
Corpus callosum
The cerebrum controls the voluntary actions of our body.
Pons helps in regulating respiration.
Which lobe is responsible sensation of pain?
Identify the CORRECT sequence of meninges. (From inside to outside)
The nervous system consists of bones, cartilages, and joints.
Trace the sequence of events which occur when you suddenly touch a hot object.
