A semipermeable membrane is any biological or synthetic membrane that allows certain molecules or ions to pass through while restricting others.
Answer:
Answer is embolism.
Explanation:
Embolism can simply be explained as a critical or serious medical condition which occurs is an obstruction s when there is an obstruction of a blood vessel such as the artery. This means that, the artery becomes blocked because of a foreign substance , usually blod clot which travels through the blood stream.
Note that, when a blood clot travels through the blood stream to the brain, it can result to embolic stroke.
Some of the things that can lodge in the blood vessel to cause blockage are fats from the marrow, air bubbles and collagen.
photosynthesis: needs light to happen
Cellular respiration: waste products are carbon dioxide and water.
Answer:
A) the concentration of calcium ions in the sarcoplasm of a resting muscle
Explanation:
Sarcoplasmic reticulum is a system of the membranous sac that is present around each myofibril and is filled with calcium ions. When muscles are in the resting stage, calcium ions are stored in the sarcoplasmic reticulum.
As the muscle action potential triggers change in voltage-gated calcium ion channels of the sarcoplasmic reticulum, the channels are opened to release the calcium ions in the sarcoplasm. Increased calcium ion levels in sarcoplasm make the muscle fibers to contract.
Removal of acetylcholine from the synaptic cleft ends the production of muscle action potential and calcium ions are moved back from the sarcoplasmic reticulum.
Hence, lower levels of calcium ions are maintained in sarcoplasm when the muscles are in the resting stage.
