Final answer:
There are no specific posterior changes in blood pressure due to gravity. The two important components of arterial blood pressure are systolic pressure and diastolic pressure.
Step-by-step explanation:
Blood pressure refers to the force exerted by blood upon the walls of blood vessels or the chambers of the heart. Regarding the effects of gravity on blood pressure, there are no specific posterior changes. However, there are two important components of arterial blood pressure: systolic pressure and diastolic pressure.
- Systolic pressure: This is the higher number in a blood pressure reading and represents the pressure exerted on the walls of arteries when the heart contracts and pumps blood out during systole (the contraction phase of the cardiac cycle).
- Diastolic pressure: This is the lower number in a blood pressure reading and represents the pressure exerted on the walls of arteries when the heart is at rest or in between contractions during diastole (the relaxation phase of the cardiac cycle).