The best description about the brain stem is: it is the most important organ of our body's survival. It connects the brain and the spinal cord, controls the vital organs like the lungs and heart and it also coordinates the many essential body reflexes.
The correct answer is the color yellow.
An afterimage is best described as a photograph that continues to seem in a single's imaginative and prescient after the publicity to the original picture has ceased. An afterimage may be a ordinary phenomenon or may be pathological. Illusory palinopsia can be a pathological exaggeration of physiological afterimages. Afterimages arise due to the fact photochemical activity in the retina keeps even whilst you are no longer experiencing the unique stimulus.
A single gene is responsible for pigmentation and hearing.
<span>disadvantages of genetic engineering are health risks, environmental impacts, impacts on agriculture and industry, and ethical issues that may arise based on the engineering</span>
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.
