The answer is concrete laundry trays.
This is because as concrete trays ages with timeit becomes coarse and rugged due to water, soap and detergents. Their smoothness gradually fades with time, thus this makes it not as good regarding to health wise standards of living.
During photosynthesis, the energy from sunlight splits water molecules to produce a chemical reaction. The hydrogen ions from water molecules are participate in the reaction by forming a sugar called glucose (C6H12O6). It can be observed that all of the hydrogen is converted to glucose, while elemental oxygen is produced.
Microbial life is important because this is bacteria. these bacteria's supply health to humans and animals. even though they also supply sickness. also these microbial life forms are the cells in us. its the oxygen in the air, its the gravity. it is everything that defines science except we cant see it. hope it helps, tag me if you need help, and plz choose brainliest
Stop , there isn’t one it’s the end of the strand
Answer:
The source of Calcium (Ca⁺⁺) for the skeletal muscle cells is the sarcoplasmic reticulum, the main store of intracellular Ca⁺⁺.
Explanation:
Calcium (Ca⁺⁺) is an ion that plays an important role in muscle contraction, a process that requires high cytoplasmic concentrations of this ion to promote myofibrillary activity.
The sarcoplasmic reticulum (SR) -equivalent to the endoplasmic smooth reticulum- is an organelle that regulates the contractile activity of skeletal muscle. The two terminal cisterns of the SR attach to the T-tube, forming a triad, which surrounds the myofibrilla.
Once the muscle cell receives the signal to contract, the Ca⁺⁺ channels are opened and allow Ca⁺⁺ to enter the cell, promoting the exit of this cation from the SR and increased its cytoplasmic levels. This stimulates muscle contraction.
