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How does oxygen move from the blood into respiring cells?

The transfer of oxygen into the blood is through simple diffusion. The oxygen molecules move, by diffusion, out of the capillaries and into the body cells. While oxygen moves from the capillaries and into body cells, carbon dioxide moves from the cells into the capillaries.

How is oxygen delivered to working muscles?

Oxygen is delivered to skeletal muscle fibers by convective transport in blood flowing in capillaries that run approximately parallel to the fibers and by diffusion from the capillaries to surrounding muscle fibers.

How does red blood cells transport oxygen?

All red blood cells contain a red pigment known as hemoglobin. Oxygen binds to hemoglobin, and is transported around the body in that way. In tiny blood vessels in the lung, the red blood cells pick up oxygen from inhaled (breathed in) air and carry it through the bloodstream to all parts of the body.

How does oxygen pass from blood to mitochondria?

Red blood cells pass through capillaries in single file due to the similar size of RBCs and the capillary caliber. As RBCs flow through capillaries, oxygen is continuously released from the RBC hemoglobin and eventually diffuses to the mitochondria where it is consumed.

Which blood vessels have the thickest muscle lining?

The tunica media is the thickest tunic; it is predominantly muscular in arterioles and most arteries, and it is predominantly elastic in the largest arteries (the so-called elastic arteries such as the aorta and the common carotid).

Where is the lowest blood flow velocity?

The rate, or velocity, of blood flow varies inversely with the total cross-sectional area of the blood vessels. As the total cross-sectional area of the vessels increases, the velocity of flow decreases. Blood flow is slowest in the capillaries, which allows time for exchange of gases and nutrients.

What is the difference between blood flow and blood velocity?

Velocity is defined as the speed of blood in unit time. Flow is the amount of blood moving per unit time.

Which would increase resistance to blood flow?

In the arterial system, vasodilation and vasoconstriction of the arterioles is a significant factor in systemic blood pressure: Slight vasodilation greatly decreases resistance and increases flow, whereas slight vasoconstriction greatly increases resistance and decreases flow.

What type of blood vessel is the thickest?

Arteries and arterioles have thicker walls than veins and venules because they are closer to the heart and receive blood that is surging at a far greater pressure (Figure 2).