why does the left ventricle contain more muscle than the right ventricle?
why does systolic pressure incresse after exersise while disatolic decreases?
The left ventricle contains more muscle than the right ventricle because its primary function is to pump oxygenated blood throughout the entire body, while the right ventricle only needs to pump deoxygenated blood to the lungs. To understand why this is the case, we can look at the circulatory system.
When blood returns from the body to the heart, it enters the right atrium. From there, it flows into the right ventricle. The right ventricle then contracts to pump the deoxygenated blood through the pulmonary artery to the lungs for oxygenation. The lungs are relatively close to the heart, so the right ventricle doesn't need as much force or muscle power to pump blood to them.
On the other hand, once the blood is oxygenated in the lungs, it returns to the heart and enters the left atrium. From there, it flows into the left ventricle. The left ventricle then contracts with a significant amount of force to pump the oxygenated blood to all the organs and tissues throughout the body, including the brain, muscles, and other vital organs. Since this requires pumping blood against much higher pressure and with greater force, the left ventricle needs more muscle mass to generate that forceful contraction.
Regarding systolic and diastolic blood pressure changes during exercise, systolic pressure refers to the higher number in a blood pressure reading (e.g., 120/80, where 120 represents systolic pressure). It represents the force exerted on the arteries when the heart contracts during each heartbeat. Diastolic pressure, the lower number, indicates the pressure in the arteries when the heart is at rest between beats.
During exercise, the body requires more oxygen and nutrients for the muscles and organs that are working harder. To accommodate this increased demand, the heart needs to pump more blood. To pump more blood out of the heart, the left ventricle contracts more forcefully, resulting in higher systolic pressure.
On the other hand, diastolic pressure tends to decrease during exercise. This is because the increased blood flow and vasodilation (widening) of blood vessels due to exercise reduce the resistance to blood flow. With less resistance, the pressure in the arteries during the resting phase between heartbeats decreases, causing the diastolic pressure to drop.
It's important to note that these changes in blood pressure during exercise vary from person to person and can be influenced by several factors, including fitness level, hydration, and underlying health conditions.