BLOOD VESSELS AND CIRCULATION (HPP)
Cards (143)
- Two sets of blood vessels in circulatory system
- transports blood from the RV, through the lungs, and back to the LA
- transport blood through all parts of the body from the left ventricle and back to the right atrium
- Functions of the circulatory system
- They diffuse from blood vessels to cells in all areas of the body
- They diffuse from the cells, where they are produced, to blood vessels
- Three main types of blood vessels
- They carry blood away from the heart
- They pump blood from the heart into large, elastic arteries that branch repeatedly to form many progressively smaller arteries
- Although the arteries form a continuum from the largest to the smallest branches, they are normally classified as
- It is the most common blood vessel type where blood flows from arterioles into this.
- Where do most of the exchange that occurs between the blood and interstitial spaces occurs?
- They are vessels that carry blood toward the heart from the capillaries
- How are veins classified as?
- The internal lining of simple squamous epithelial cells which is continuous with the endocardium of the heart
- What does the capillary wall primarily consist of which rests on a basement membrane?
- These are scattered along the length of the capillary that is closely associated with the endothelial cells
- How many in diameter does a capillary range from?
- Approx. how long are capillaries?
- How do RBCs flow through most capillaries?
- How are capillaries classified as depending on their diameter and permeability?
- They are approximately 7–9 μm in diameter, and their walls exhibit no gaps between the endothelial cells; Less permeable
- Where do continuous capillaries exist?
- These capillaries are in tissues with where capillaries are highly permeable such as the intestinal villi, ciliary processes of the eyes, choroid plexuses of the CNS, and glomeruli of the kidneys
- These are areas approximately 70–100 nm in diameter in which the cytoplasm is absent and the plasma membrane consists of a porous diaphragm that is thinner than the normal plasma membrane
- They are larger in diameter capillaries than the other two and their basement membrane are less prominent/completely absent; Fenestrae are larger and gaps can exist in endothelial cells
- Where do most sinusoidal capillaries occur?
- are large-diameter sinusoidal capillaries which are common in the liver and bone marrow; basement membrane is often sparse & missing; cells can readily move across walls in the endothelial cells
- are similar in structure to the sinusoidal capillaries but even larger in diameter; exist primarily in the spleen; Large gaps between endothelial cells
- How do substances cross capillary walls?
- Where do larger water soluble substances must pass through?
- They supply blood to each capillary network
- These are vessels with isolated smooth muscle cells along their walls, where blood flows from arterioles to this
- From metarterioles, blood flow to this vessel that extends in a relatively direct fashion from a metarteriole to a venule
- They are smooth muscle cells located at the origin of the branches that regulate blood flow of branches from several capillaries from the thoroughfare channels
- The ends of capillaries closest to the arterioles
- The ends closest to venules
- They are more numerous and more extensive in highly metabolic tissues, such as in the lungs, liver, kidneys, skeletal and cardiac muscle
- TRUE OR FALSE: Capillary networks in the dermis of skin have less thoroughfare channels than capillary networks in cardiac or skeletal muscle
- Major function of capillary in muscle tissues