What is systole? The sinoatrial artery acts as the natural pacemaker that sends an impulse. This impulse causes contraction of the atria and forces blood into the ventricles. This impulse then transfers to the atrioventricular node and His-Purkinje network. This transfer of the impulse causes ventricular contraction. The ventricular contraction pumps blood to the aorta and pulmonary artery. Then, the ventricles relax. This relaxation of the ventricles causes the heart chambers to fill with blood. The arterial blood pressure is at its maximum during contraction. The pressure is at its minimum during relaxation.

The ventricular contraction pumps blood to the aorta and pulmonary artery.

Explanation:

The systole is the process that occurs in human heart. In this the ventricles of the heart contract and expel out blood that is transferred to the aorta and pulmonary artery. The blood pressure of the body increases in this process through arteries are the blood is circulated to all the parts of the human body. After pumping out blood the ventricles relax and again fill with blood. This is called ventricular diastole.

to increase speed you need to decrease frictiona dn drag hense why sprinters wear tight track suits to keep tight against there skin to keep away from wind and decrease the amount of drag you are carrying.a swimmer will wear the tightest swim suit they can possibly fit into (i was a size 28 swim suit at meets i wore a   size 23) why? because the tighter your clothing is the less drag and negative force you have. the heavier the clothe the slower and more wind gets caught. cotton tends to hold onto alot of sweat and water making it slower then say a track suit (no idea what they are made of but they are really comfy around your answer )

i think your answer is c. measurement system in which the medication dosage was calculated.