Answer:
cornea is the part of eye that help to focus
Answer:B C D I think because a lysosome is a organelle
Explanation:
Since, the options have not been listed. All factors that reduce the SIDS is included in the answer.
Answer:
SIDS ( Sudden infant death syndrome) denotes the actual or the sudden death of the infants below one year of the age. This is the leading cause of the death of the infants.
Physical as well as physiological factors might reduce the chances of SIDS. The maintenance of the proper weight in infants reduces the death of infants. The inhibition of the use of tobacco and drugs during the gestation period is also helpful to reduce the SIDS condition. The proper sleep environment and routinely medical checkup reduces the SIDS cases.
Answer:
1.An action potential is conducted deep into the muscle fiber by the T tubule.
3.The membranes of the sarcoplasmic reticulum become more permeable to calcium ions.
4.Calcium ions diffuse into the sarcoplasm around the myofibril.
2.Calcium ions bind to troponin.
5.The troponin-tropomyosin complex moves exposing active sites.
Explanation:
The arrival of a nerve impulse at synaptic end bulbs stimulates the release of acetylcholine into the synaptic cleft. The acetylcholine binds to its receptors located on the motor end-plate followed by the opening of ion channels to allow the small cations such as Na+ to enter the muscle fiber and make it positive.
The change in the membrane potential triggers the action potential that propagates along the sarcolemma into the T tubules. The action potential stimulates the release of calcium ions from the sarcoplasmic reticulum into the sarcoplasm.
The released calcium ions combine with troponin. Binding of calcium ions to troponin stimulates conformational change in troponin that makes the tropomyosin to shift away from the myosin-binding sites of actin.
The myosin heads join the free binding sites to form cross-bridges leading to contraction of muscle fiber.