Answer:
1- sarcoplasmic reticulum
Explanation:
2- electrical current
3-calcium
Answer:
The heart consists of four chambers in which blood flows. Blood enters the right atrium and passes through the right ventricle. The right ventricle pumps the blood to the lungs where it becomes oxygenated. The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium.
Explanation:
not doing enough physical activity · being too sedentary, ie sitting or lying down for long periods · having an unhealthy diet, eg eating too much or too little, ...
A 140 over 90 you most likey have high blood pressure normal is120 over 80