blood moving through vessels
steady flow once the blood reaches smaller arteries and
capillaries
blood flows slower because capillaries have narrow lumens
causing blood to slow down due to friction against the walls
steady flow begins to allow the exchange of materials via diffusion
and allows to maintain a constant concentration gradient
there is a large network of capillaries close to every cell so there is
a small diffusion distance
veins
the heart has less of direct effect of blood flow
steadily without pulses
low pressure
how is blood flow assisted?
valves stop back flow
contraction of skeletal muscles via movement of limbs/ breathing
low pressure on the thorax when breathing
why is the heart not able to obtain oxygen/ nutrients from within it’s
chambers?
large diffusion distance
heart muscle is supplied via the coronary circulatory system,
which consists of two vessels called the coronary arteries,
capillaries and two coronary veins
steady flow once the blood reaches smaller arteries and
capillaries
blood flows slower because capillaries have narrow lumens
causing blood to slow down due to friction against the walls
steady flow begins to allow the exchange of materials via diffusion
and allows to maintain a constant concentration gradient
there is a large network of capillaries close to every cell so there is
a small diffusion distance
veins
the heart has less of direct effect of blood flow
steadily without pulses
low pressure
how is blood flow assisted?
valves stop back flow
contraction of skeletal muscles via movement of limbs/ breathing
low pressure on the thorax when breathing
why is the heart not able to obtain oxygen/ nutrients from within it’s
chambers?
large diffusion distance
heart muscle is supplied via the coronary circulatory system,
which consists of two vessels called the coronary arteries,
capillaries and two coronary veins
