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Blood vessels function to transport blood. In general, arteries and arterioles transport oxygenated blood from the lungs to the body and its organs, and veins and venules transport deoxygenated blood from the body to the lungs. Blood vessels also circulate blood throughout the circulatory system. Oxygen (bound to hemoglobin in red blood cells ...
A blood cell (also called a hematopoietic cell, hemocyte, or hematocyte) is a cell produced through hematopoiesis and found mainly in the blood. Major types of blood cells include red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). Together, these three kinds of blood cells add up to a total 45% of the ...
Tunica media. Transverse section through a small artery and vein of the mucous membrane of the epiglottis of a child. (Tunica media is at 'm'.) The tunica media (Neo-Latin "middle coat"), or media for short, is the middle tunica (layer) of an artery or vein. [1] It lies between the tunica intima on the inside and the tunica externa on the outside.
Vein. Structure of a vein, which consists of three main layers; an outer layer of connective tissue, a middle layer of smooth muscle, and an inner layer lined with endothelium. Veins (/ veɪn /) are blood vessels in the circulatory system of humans and most other animals that carry blood towards the heart.
Blood accounts for 7% of the human body weight,[9][10]with an average density around 1060 kg/m3, very close to pure water's density of 1000 kg/m3.[11] The average adult has a blood volumeof roughly 5 litres(11 US pt) or 1.3 gallons,[10]which is composed of plasma and formed elements.
Body (labeled as "shaft") at the top. The clitoral body (also known as the shaft of the clitoris) [ 38 ][ 39 ][ 40 ] is a portion behind the glans that contains the union of the corpora cavernosa, a pair of sponge-like regions of erectile tissue that hold most of the blood in the clitoris during erection.
The circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the entire body of a human or other vertebrate. [1][2] It includes the cardiovascular system, or vascular system, that consists of the heart and blood vessels (from Greek kardia meaning heart, and from Latin vascula ...
Found in the muscle tissue of many vertebrates, including humans, it gives muscle tissue a distinct red or dark gray color. It is very similar to hemoglobin in structure and sequence, but is not a tetramer; instead, it is a monomer that lacks cooperative binding. It is used to store oxygen rather than transport it. Hemocyanin