Due on Wednesday (07/04) ps brachi contracts, the elbow flexes. When the triceps
ID: 3522603 • Letter: D
Question
Due on Wednesday (07/04) ps brachi contracts, the elbow flexes. When the triceps brachi contracts the elbow extends. Explain the role of agonist and antagonist in both of these movements. s in Describe how the body maintains posture - Compare and contrast the role of Catt in excitation, contraction, and relaxation of a skeletal muscle. - Using fiber types, design a muscle for a marathon runner and a different muscle for a 100-yard dash sprinter. Explain your answer Respond to two of your peers: is their answer correct? Feel your own tricep as you pretend to do a biceps curl (contraction). Does the tricep truly relax? Extend your your bicep, does it truly relax? Why do you suppose when you do these movements slowly you still feel the antagonist muscle flex? Explain a condition where the body cannot maintain posture or posture is compromised. What would a remedy for that ailment would be? a disease that may affect individual muscle cells or sysiems. What are the possible treatments? MESSAGEExplanation / Answer
1) Agonist is a muscle which when contacted is responsible for producing a perticular movement. It is also known as a prime mover. For example, biceps brachii.
Biceps brachii is an agonist that makes the elbow flex.
Antagonist is a muscle whose contactions oppose the agonist. For example, triceps brachii.
Triceps brachii is an antagonist to biceps brachii as it will extend the elbow.
2) Posture can be said as the ability of keeping a group of muscles contacted. The variations in degrees of muscle contactions determine the posture of any individual.
Muscles present in the body are the mixture of pale and red muscles. But most of the muscles involved in maintaining the posture are red muscles, as they are not easily fatigued. Postural refles plays an important role in maintaining postures as they provied adjustments necessary to keep a posture.
There are two types of reflexes. 1) Static reflexes - they work with gravitational pull
2) Statokinetic reflexed - they work with acceleratory displacement of the body.
The decision of posture maintainance is done in cortex, while its planning is done in basal ganglia and the cerebellum. The information for maintaining the posture comes from the pyramidal tract to the motor neurons in the muscles.
3) Calcium plays a major role in each muscle activity. Calcuim has contrasting roles in contaction, relaxation and excitation of the muscle fibres.
1) contaction : When there is a temporary imbalance in muscle fibre of sarcolemma and T-tubule, the impulse triggers the release of calcium from sarcoplasmic reticulum. Calcium combines with troponin into the thin filaments of myofibrils. This causes muscle contactions.
2) Relaxation : Due to the higher affinity of sacs in SR and calcium, in milliseconds ofits release, the calcium is recollected in the sacs again.
3) Excitation : In both excitation and contraction, the calcium is released from SR and binds to the troponin in thin filaments of myofibrils.
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