4. Write the main functions of the following:
(a) Sensory neuron (b) Cranium
(c) Vertebral column (d) Motor neuron
Answers
Answer:
(a)Sensory neurons are nerve cells within the nervous system responsible for converting external stimuli from the organism's environment into internal electrical impulses. For example, some sensory neurons respond to tactile stimuli and can activate motor neurons in order to achieve muscle contraction.
(b)Cranium
Cranium is the skull bone that protects the brain from external factors.
The cranial bone is rigid in structure that acts as a helmet.
It also gives protection to the organs of vision, smell etc associated with it.
It protects the brain by covering the thin membrane, called meninges.
(c)The major function of the vertebral column is protection of the spinal cord; it also provides stiffening for the body and attachment for the pectoral and pelvic girdles and many muscles. In humans an additional function is to transmit body weight in walking and standing.
(d)The Main Functions Of a Motor Neuron are :
They are responsible for locomotion or movement. Some skeletal muscles include intercostal muscles, thigh and limb muscles, arm muscles, and several others which help in the movement of bones and support the skeleton.
They stimulate organ-related muscles.
Explanation:
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