Ch 23 - Vessels and Circulation Flashcards
Blood Vessels
Arteries
Carry blood from the heart and toward capillaries
Prominent layer of smooth muscle that is under control of the autonomic nervous system and various hormones
Types of Arteries
(3 TYPES)
* Elastic - Largest conducting artery away from heart, strong; aorta, pulmonary, subclaviar, Branchiocephalic, common carotid, common illiac arteries
* Muscular - Medium distributing artery, blood to body organ/tissue
* Arterioles
Arterioles
small arteries that connect to the capillaries
Capillaries
Serve as the site for transfer between blood and interstitial space
has layer of Endothelium (simple squamous epithelium)
Veins
Flaccid
Carry blood away from capillaries and to the heart
has extension of the the endothelium that serve as valves
Venules
small veins that connect to the capillaries
Lumen
open space inside of vessel
Arteries and veins
Tunica Interna
(Arteries and vein layer)
Deep layer
Endothelium (Endothelial lining) -Simple Squamous epithelium
Internal Elastic Lamina
(Arteries and vein layer)
Intina
2nd deepest layer
Elastic connective tissue prominent in arteries
Tunica Media
(Arteries and vein layer)
Middle layer
concentric sheets of smooth muscle
External Elastic Lamina
(Arteries and vein layer)
After middle layer
Elastic connective tissue, prominent in veins
Tunica External
(Arteries and vein layer)
Adventitia
Superficial Layer
Connective tissue sheath
Smooth Muscle
Smooth Muscle Cells
(Muscle Cell)
Short Spindle shaped cells with single nuclei
Endomysium
(smooth muscle)
Fibrous connective tissue connecting smooth muscle cells together side by side and end to end
Microcirculation
Fluid moves between blood (vascular space) /Interstitial space –> Interstitial space/ cells (intracellular space)
Vascular Space
space in the lumen of blood vessels that contains the blood
Interstitial space
space between cells and the space between cells and capillaries containing interstitial fluid (integral part of fibrous connective tissues
Extracellular Space
Vascular space plus interstitial space (space outside of the cell)
Intracellular Space
Space inside of cells that contains the cytoplasm
Blood capillaries
Thin walled vessels between the smallest arteries and veins where exchange of oxygen, nutrients, wastes, and other substances occurs between the blood and the interstitial fluid
Lymphatic Capillaries
Recovers plasma lost from the blood capillaries for return to the systemic venous circulation
