Final answer:
Blood flow refers to the movement of blood through vessels, tissues, or organs and is influenced by various factors. It is initiated by the contraction of the heart's ventricles and involves flow from regions of higher pressure to lower pressure.
Step-by-step explanation:
Blood flow refers to the movement of blood through a vessel, tissue, or organ, and is usually expressed in terms of volume of blood per unit of time.
It is initiated by the contraction of the ventricles of the heart.
Ventricular contraction ejects blood into the major arteries, resulting in flow from regions of higher pressure to regions of lower pressure, as blood encounters smaller arteries and arterioles, then capillaries, then the venules and veins of the venous system.
This section discusses a number of critical variables that contribute to blood flow throughout the body. It also discusses the factors that impede or slow blood flow, a phenomenon known as resistance.