When the heart contracts, called systole, blood pressure increases. When the heart relaxes, called diastole, blood pressure decreases. Systole phase or contraction is started by the electrical cells of the sinoatrial node. The diastole phase is the period when the heart relaxes after contraction.<span> </span>
Diatom is a major group of algae. This specific type are single-celled alga consisting of a cell wall made of silica.
Answer:
we need lymphatic system too,it is as important as circulatory system.
Explanation:
The lypmphatic system is part of the circulatory system, known as lymphatic veesels.
Answer: I think that stress affects the vision because when your mind is only focused on fighting that something or fleeing from it, that's all you're going to see/be focused on.
For example if your mind was focused on "Fight" then that would be what your doing whether you like it or not.
If your mind is focused on "Flight" then you would be trying to escape from whatever it is almost like your body is moving on it's own.
