It is true that the potential must be strong enough to send
a potential to the CNS. The stronger the potential, the more it will excite the
transmitter in relaying the message to another neuron, therefore, if this
happens, the more will it be easier to pass the message.
Answer:
The correct answer is C
Explanation:
Cytotoxic cells are lymphocytes that kills or destroy cancerous cells, infected cells especially the one infected with virus, and damaged cells.
Cytotoxic cells does not secret antibodies to fight pathogens but the secret granzyme and perforin to kills infected cells.
They recognised their host cells by using their T cell receptors(TCR).
Answer:
pressure changes of alternating contraction and relaxation during the cardiac cycle.
Explanation:
Opening and closing of heart valves are regulated by changes in the blood pressure of various heart chambers during the cardiac cycle. During atrial systole, the higher blood pressure in the atria opens both AV valves and forces the blood to enter the ventricles. The semilunar valves are closed. During ventricular systole, the higher blood pressure in the ventricles opens both semilunar valves to allow the blood to enter the pulmonary trunk and aorta. At this time, both the atrioventricular valves are closed.
