### body part:

Vein
* All veins carry blood away from the heart
  - deoxygenated blood
* Many veins follow the branching and distribution pattern of the artery of the same name
  - have valves that allow blood flow in one direction only
* Most veins affect hearts
  - bring blood
* Most veins carry blood that is low in oxygen back to the heart
  - warm blood
  - collect blood
* Most veins contain blood
  - dark red blood
  - deliver blood
  - fill with blood
* Most veins have one-way valves called venous valves to prevent backflow caused by gravity
  - that keep blood from going backwards
* Some veins carry carbon dioxide
  - nutrients
  - testosterone
  - contain urea
  - drain erectile tissue
  - have veins
* accompany the arteries listed above.
* also have valves to prevent the backflow of blood.
* always carry blood to the heart
  - deoxygenated blood in the adult animal
* appear blue because light, penetrating the skin, is absorbed and reflected back to the eye.
* are a very low-pressure, low stress conduit.
* are blood vessels that carry blood to the heart
  - return blood from the body to the heart and lungs to get more oxygen
  - through which blood travels from all parts of the body back to the heart
* are blood vessels which carry blood back to the heart
  - to the heart from various parts of the body
  - depsoits of foreign material within a rock fracture
  - elastic vessels that transport blood to the heart
  - especially sensitive to pressure
  - flat and have thinner walls than arteries
  - much thinner than arteries and under much lower blood pressure
  - part of circulatory systems
  - ribs
* are the blood vessels responsible for returning deoxygenated blood to the heart
  - only blood vessels that have valves
  - structural support for the photosynthetic tissue of the leaf
  - tubes in our bodies that carry blood throughout the body
* are the vessels that carry blood from various parts of the body back to the heart
  - take fluid out of the legs and back up to the heart
  - thin-walled and can expand more than arteries
  - usually larger in diameter and thinner-walled than arteries
  - vessels that bring blood to the heart
* become larger and larger as they get closer to the heart.
* branching angles are also diverse across species.
* bring blood to the left and right atria
  - xylem and phloem into close contact with photosynthetic tissue
* can be prominent in pregnant and fair-skinned women.
* carry blood back to the heart as well as carry waste away from cells
  - once the oxygen and food have been used by the body's cells
* carry blood from capillaries to the heart
  - organs to atria of heart
  - low in oxygen from various parts of the body back to the heart
* carry blood that has circulated from the body back to the heart
  - is higher in waste products and carbon dioxide back to the heart and lungs
* carry blood to our heart
  - the heart and enter the heart through the vena cava
  - toward heart, from tissues
  - with waste products away from the udder
  - without oxygen to the heart from the muscles
* carry deoxygenated blood back to the lungs
  - from parts of the body to the heart
  - food and water in a leaf
* carry the blood from the legs back to the heart
  - through the body and back to the heart
  - oxygen poor blood back to the heart
  - waste products for removal
  - water and nutrients within the leaf
  - the deoxygenated blood and carry it back to the heart
* commonly host the economic minerals.
* constitute the vascular tissue with the xylem on top and phloem below.
  - valves to assist blood flow
* converge to form a venous circle before leaving the mammary gland.
* deal with blood that is being returned to the heart.
* draining the lower part of the body lead to the inferior vena cava
  - upper portion of the body lead to the superior vena cava
* essentially form when extension in a rock produces a crack.
* generally arise from capillary beds at the tail ends of arteries.
* get bigger as they go toward the heart.
* have a thinner muscle layer and less elastic tissue than arteries
  - arrangements
  - less smooth muscle, but it is also of great importance
* have one-way valves to keep gravity from pulling the blood downward
  - particular arrangements
  - small valves that allow blood to flow only one way, back up to the heart
* have thinner walls and tend to have wider lumens
* have valves that allow blood to flow only towards the heart
  - are designed to prevent blood from flowing backwards due to gravity
  - stop blood from moving backward
* help to get blood to the body parts
  - regulate the amount of blood flow
* lead back to the heart, where blood gets pumped to the lungs.
* leave the thymus along with the efferent lymphatics via the septa.
* lie in loose superficial connective tissue.
* move blood.
* narrow the pipe and speed up the flow back to the heart.
* normally allow blood to go in one direction by having valves in the system.
* push blood toward the heart.
* rely on internal valves to keep blood flowing upward, against gravity.
* require the muscles in our feet and legs to return the blood, against gravity, to the heart.
* return blood from the tissues to the heart, merge to become larger as they approach heart.
* serve both mechanical and conducting functions in the leaf, as in the stem.
* take blood back to the heart
* taking blood away from the penis get smaller , so less blood is taken through.
* then deliver the oxygen-depleted blood back to the right half of the heart.
* use the muscles in our feet and legs to return the blood, against gravity, to the heart.
+ Circulatory system, Systemic circulation
  * On the other end of the capillary, it turns into a venule. Venules are the smallest veins. Veins take blood back to the heart. As veins go back to the heart, they get bigger. The biggest systemic veins in the body are the vena cava. There are two vena cava. The 'inferior vena cava' takes blood from the lower part of the body to the right side of the heart. The 'superior vena cava' takes blood from the upper part of the body to the heart.
  * A 'vein' is a type of blood vessel in the body. All veins carry blood to the heart. Most veins carry blood that is low in oxygen, except for the pulmonary vein and the umbilical veins which carry blood that is high in oxygen.
  * There is smaller amounts of smooth muscle and elastic fibres in the vessel wall. Most veins have one-way valves that keep blood from going backwards.
  * Veins carry blood to the heart and enter the heart through the vena cava. Other important veins are the coronary veins and renal veins
  - system: Cardiovascular system
  * Blood vessels that take blood towards the heart are veins. Veins get bigger as they go toward the heart. The smallest veins are called 'venules'
+ Penis, Erection: Anatomy of the male reproductive system
  * In an erection, the penis fills with blood. The blood makes the penis become longer, thicker and harder. Veins taking blood away from the penis get smaller, so less blood is taken through. Arteries bringing blood to the penis get wider, bringing more blood to the penis.