Answer:
This is why Killer T-cells are also called Cytotoxic T-cells. The pieces of destroyed cells and viruses are then cleaned up by macrophages. The other type of T-cell is the Helper T-cell. When a T-cell finds its virus match in your body, it makes many copies of itself to attack that virus.
Answer: True
Explanation:
The given statement is true as, the digestive nerve plexus circulates the movement of the digestive system and compromises the two nerve center that are:
- Meissner nerve plexus
- Myenteric nerve plexus
Basically, it present in the longitudinal muscles and in circular layer muscles in the lower stomach and helped in transmitted the message muscles cell from the nervous system. That is why, it provided the nerve supply to the GI tract wall and help in control the GI motility.
Answer:
The semilunar valves open during the ejection phase due to the pressure on the left ventricle being higher than the pressure in the aorta and pulmonary artery.
Explanation:
During the ejection phase occurring in the ventricular systole, the pressure in the left ventricle increases and overpasses the pressure in the aorta and pulmonary artery. At this point the semilunar valves open, allowing the blood to flow from the ventricle into the arteries.
