4. Drinking a glass of water is a normal daily activity in which the mind and bo

Question

4. Drinking a glass of water is a normal daily activity in which the mind and body are involved in the controlled task. Explain how the movements happen once your mind indicates that you are thirsty involvement, muscular contractions and which proprioceptors are involved. regarding the CNS 5. With the wrist in neutral, extend the fingers maximally and attempt to maintain the position and then extend with wrist maximally. What happens to the fingers and why? (You may have to you force from your own hand to maximally extend your wrist) 6. Chose a particular sport skill and determine type of muscle contractions occurring in various major muscle groups about the body during the movement phase of the skill.

Explanation / Answer

Decrease in volume of extracellular fluid stimulates osmoreceptors of brain in hypothalamic center the person seeks sensation of thirst,thus water is absorbed in to GIT ,hence there is increase in volume of extracellular increased osmolarity of ECF, causes decrease in saliva secretion causes dry mouth,the person seeks thirsty and drins water,water absorbed from GIT causes decreased osmolarity of extracellular fluid..

The finger joints flexed more in supination than in neutral posture and pronation and the thumb flexed more than the other fingers because of the gravity and skin tension.

There are different types of muscle contractions,isotonic contractions it includes concentric-shortening of muscle and eccentric-lengthening of muscle

and isometric contractions it includes no movement,muscles are working to keep joint stable.

Isotonic contractions are most important type of contractions in sports people especially game players they produce both the speed and power.

Neuromuscular principle transmission at the skeletal muscle occurs when a acetylcholine from the nerve ending is released and binds to the nicotinic acetylcholine receptors on the postjunctional muscle membrane.Athletic persons increases stamina for isometric contractions,there are slow twitch and fast twitch of contractions.

Most sensory neural transmission does not pass directly to brain but to the synapse of the spinal cord,it carries to the posterior horn of spinal cord or brainstem,only few neurons are involved it is reflex arc.

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