Answer:
D. capillaries
Explanation:
Capillaries connect the arterial system — which includes the blood vessels that carry blood away from your heart — to your venous system. Your venous system includes the blood vessels that carry blood back to your heart.
The exchange of oxygen, nutrients, and waste between your blood and tissues also happens in your capillaries. This happens through two processes:
- Passive diffusion. This is the movement of a substance from an area of higher concentration to an area of lower concentration.
- Pinocytosis. This refers to the process through which your body’s cells actively take in small molecules, such as fats and proteins.
The walls of capillaries are made up of a thin cell layer called endothelium that’s surrounded by another thin layer called a basement membrane.
Their single-layer endothelium composition, which varies among the different types of capillaries, and surrounding basement membrane makes capillaries a bit “leakier” than other types of blood vessels. This allows oxygen and other molecules to reach your body’s cells with greater ease.
Additionally, white blood cells from your immune system can use capillaries to reach sites of infection or other inflammatory damage.
Short message:
Correct me if im wrong :l
