Final answer:
As blood flows from Point A to Point B within an artery, the systolic blood pressure at Point B will be slightly lower than at Point A due to peripheral resistance and the decrease in hydrostatic pressure. However, without additional details, we cannot determine the exact systolic blood pressure at Point B.
Step-by-step explanation:
The systolic blood pressure measures the amount of pressure that blood exerts on the vessel walls during the heartbeat. This pressure decreases as blood travels through the vascular system, from higher pressure zones near the heart to lower pressure areas as it reaches the arterioles and capillaries. Given this information, when blood flows 5 cm from Point A to Point B within an artery supplying the brain, the systolic blood pressure at Point B will be slightly lower than the systolic blood pressure at Point A due to the resistance to blood flow, known as peripheral resistance, and the loss of hydrostatic pressure.
However, without more specific information about the resistance of the vascular system or any potential elevation changes between these two points, it is not possible to calculate the exact systolic blood pressure at Point B. Normally, in a static situation (where there's no significant elevation change to factor in), the decrease in systolic pressure is due to the vascular resistance encountered as the blood moves away from the heart. In the human body, the decrease in pressure also depends upon factors like blood vessel elasticity and the cross-sectional area of the vascular bed.