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Capillaries
The smallest vessels in the circulatory system that are located within the tissues of the body, they transfer blood from the arteries, through the tissues to drop of nutrients and pick up waste and back to the veins.
1,213 Questions
How is the blood flow through capillary beds locally controlled?
This involves the local control of smooth muscle in microcirculation. The metarterioles function as shunts to bypass capillaries and the rings of smooth muscle at strategic locations . They can contract to increase blood flow through capillaries and vice versa. The pre-capillary sphincters contract and relax in response to local factors only. Its contraction constricts the capillary and decreases blood flow and vice versa.
Capillaries carry------------- from the --------to the body?
capillaries carry blood from the heart to the body
Diffusion
How are the lungs and the capillaries connected?
The lungs contain air sacs called alveoli which are surrounded by blood capillaries to allow gaseous exchange.
Why are networks of capillaries located on the surface of the stomach the intestines and uterus?
There are interlocking networks of capillaries on the surface of the stomach and intestines to absorb digested nutrients from food and transport those nutrients throughout the body. The uterus has capillary networks for the reverse reason - to supply nutrients to a growing fetus.
Why the tissue fluid can escape from capillaries but the erythrocytes can not?
The escape of tissue fluid from the capillaries occurs through small gaps present in the walls of the capillaries.These gaps are quite big so as to allow the passage of fairly large molecules but are not large enough to allow the escape of erythrocytes.
Why it is better to prick from ring or middle finger for capillary blood collection?
They have slightly fewer nerves so it will hurt less.
Why is cutting an artery more dangerous than cutting your capillaries?
Cutting an artery is much more dangerour even lethal than cutting a capillary. The arteries are the largest of blood vessels overall where as capillaries are the smallest overall.
What is the difference between a vein and venule?
A vein is larger than a venule. It is also closer to the heart and farther from the capillaries than a venule.
its the blood which act as a transporter and the concentration of blood determines that oxygen will diffuse faster than carbon dioxide due to its small molecular weight but if diffusion occur in such manner then amount of carbon dioxide will be automatically more. carbon dioxide is a toxic gas and its presence in more amount can causes problems by increasing the PH of blood,but carbon dioxide has an affinity for water. The excess carbon dioxide gets dissolve in water or simply we can say in plasma of blood more than oxygen so its its excrete in lungs and passes from lungs to mouth in atmosphere following bronchioles and bronchi.
Does oxygen and carbon dioxide moving from alveoli to capillaries requires energy?
It does not require energy. It move down the concentration gradient naturally.
What are the function of capillary?
the movement of a liquid along the surface of a solid caused by the attraction of molecules of the liquid to the molecules of the solid
What is the function capillaries?
narrowest blood vessel in vertebrates measuring 0.008-0.02 mm in diameter, barely wider than a red blood cell. Capillaries are distributed as beds, complex networks connecting arteries and veins. The function of capillaries is to exchange materials with their surroundings. For this reason, capillary walls are extremely thin, consisting of a single layer of cells through which nutrients, dissolved gases, and waste products can easily pass. This makes the capillaries the main area of exchange between the fluid (lymph) bathing body tissues and the blood. They provide a large surface area in order to maximize diffusion.
All body cells lie close to capillaries so they can receive the food and oxygen they require from the capillaries. Networks of capillaries are especially extensive in certain parts of the body. For example, in the lungs they surround the air sacs (alveoli), taking up oxygen and releasing carbon dioxide. They are also found in the lining of the gut - in little finger-like projections called villi - where they absorb the products of the digestion of food.
