Histo Circulatory Flashcards
2 Divisions of Circulatory system
1) Pulmonary circulation
2) Systemic circulation
Circulation going towards the lungs
Pulmonary circulation
Circulation from Heart and towards the rest of the body
Systemic circulation
Components of the Circulatory system
Heart
arteries
Capillaries
Veins
Component of Circulatory system
where it pumps blood through the system
Heart
Component of Circulatory
Blood vessels efferent from the heart
Arteries
Component of Circulatory
Smallest vessel, site of O2, CO2, nutrient, and waste exchange
Capillaries
Component of Circulatory
Carry blood towards the heart
Veins
Chambers of the heart: (4)
Right atrium
Left atrium
Right ventricle
Left ventricle
Supply blood towards the muscle of the heart
Coronary arteries
Major layers of the heart layer
Endocardium (Inside) (Conduction layer)
Myocardium
Epicardium (Covering) (Visceral cardium)
Semipermeable barrier between blood and interstitial fluid
Endothelium
Squamous, polygonal, elongated with the long axis in the direction of blood flow
Endothelium
Tissues of the vascular wall
Functions of Endothelium
1.) Presents a nonthrombogenic surface
2.) Regulate local vascular tone and blood flow
3.) Inflammation and local immune response
4.) Secretion of growth factor
Tissues of the vascular wall
Arranged in layers
Smooth muscle
Tissues of the vascular wall
Variable amounts and proportions based on local functional requirement
Connective tissues
Tissues of the vascular wall
Wall of all blood vessels except _________________ contain smooth muscle and connective tissue
capillaries
Blood vessel layers
Endothelium, loose connective tissue, smooth muscle fibers
Tunica Intima
Blood vessel layers
Concentric layers of helically arranged smooth muscle, elastic fibers
Tunica Media
Blood vessel layers
Type 1 collagen and elastic fibers
Vasa vasorum “Vessels of the vessel”
Tunica Adventitia
“Vessels of the vessel”
Vasa vasorum
Arterial sensory structures
Baroreceptors (Blood pressure)
Carotid sinuses (Neck)
Arterial sensory structures
Chemoreceptors (O2, CO2, pH)
Carotid bodies and aortic bodes
Arterial sensory structures
Dopamine, acetylcholine (neurotransmitters)
Glomus cells
Alternative microvascular pathways
Arterioles bypass capillary networks and connect directly to venules
Arteriovenous shunts
Alternative microvascular pathways
Blood flows through two successive capillary beds separated by a portal vein
Portal system
Collects interstitial fluid from the tissue spaces as Lymph and return it to the blood
Lymphatic Vascular System
