Cvs 3 - Part 1 Flashcards
• Blood filters out through the?
Capillaries
• Arteries and veins have 3 tunics called
Tunica media
Tunica interna
Tunica externa
Tunica interna structure
covered with endothelium, SIMPLE squamous epithelium
Tunica interna function
allows for the diffusion of materials
Tunica media structure
Smooth muscle and elastic fiber layer,
Tunica media function
Regulated by?
controls vasoconstriction of the vessels
regulated by the sympathetic nervous system;
Tunica externa structure
Collagen fibers
Tunica externa function?
protect and reinforce vessels
Elastic arteries 2 main characteristics
• Elastic arteries are the largest arteries; have a lot of elastic in their TUNICA MEDIA;
Elastic arteries function
they create a tightness in the walls of the arteries that maintain blood pressure
Muscular arteries function
Supply the organs of the body
Human blood pressure is only significant in the _______ of the body, but very insignificant in the _______.
Arteries
Veins
Muscular (medium) arteries characteristic
tunica media contains most amount of smooth muscle
Hence why they are called muscular arteries
Arterioles
Smallest arteries in the body
Alpha 1 Adrenergic Receptor found in the
smooth muscle of the Tunica Media of the arteries
What happens when Alpha 1 Adrenergic Receptor is stimulated
Which leads to?
increases the availability of calcium within the smooth muscle
leads to smooth muscle contraction and vasoconstriction
Vasoconstriction
When the diameter of the blood vessel reduces
Blood pressure =
Cardiac output (C.O) × Peripheral Resistance (P.R
Systemic Peripheral Resistance –
measures the total peripheral resistance
Vasodilation
What is it?
Why does it happen?
– where the diameter of the blood vessels increases because of a drop in the systemic peripheral resistance
When does vasodilation occur
when medications block the alpha 1 receptors or calcium channels in the smooth muscle
Cardiac output =
• Cardiac Output = Stroke Volume × Heart Rate (normal should be about 5 liters)
All of your body’s blood is recycled throughout the body by the heart every minute
K
What is the blood pressure in the large veins as they pour the blood into the heart?
Zero
There is no pump that pumps the blood in the veins, the blood is moved in one direction only towards the heart because of the presence of valves
• Blood brings what two major things to the body?
Oxygen and glucose
