Answer:
The correct answer will be option-D.
Explanation:
Calcium plays an important role in muscle contraction as they are released from the sarcoplasmic reticulum after they receive electric impulse.
Calcium triggers the muscle contraction cycle as these calcium ions bind to the troponin-tropomyosin complex. This binding exposes the myosin-binding site on the actin on which high energy myosin binds and cross-bridge is formed.
This cross-bridge formation causes the contraction of the sarcomere and therefore muscle contracts.
Thus, option-D is the correct answer.
Your skeletal system protects the heart, which is the main organ of the cardiovascular system, b<span>y directing the body to respond appropriately to the information it receives.</span>
The vessel and cardiovascular system pump and transport the blood to the muscles that they additionally <span>would like.
</span>It depends<span> on the </span>metastasis to assist offer<span> it with the </span>Oxygen<span> the muscles </span>want. The cardiovascular<span> and </span>vascular system<span> pump and transport the blood to the muscles </span>that<span> they </span>conjointly want.
Protection for the head is needed in cases of direct collision sports like hockey and football. Collisions with another player or the turf may result in a concussion, thus all the helmets must possess NOCSAE certifications.
The helmet should fit comfortably around all the segments of the player's head, there should be no gaps between the head and pads. It should cover the base of the skull, the pads positioned at the back of the neck should be comfortable, and at the same time should not be uncomfortable.
The helmet should not come down over the eyes, the front edge of the helmet should be 3/4 inch or of two finger widths above the eyebrows.
