Cardiovascular System
Why do we need it?
Blood supply is a transport medium
Oxygen
Energy/nutrients
Waste products
Cells for repair/defense
Temperature regulation
Conserve/release heat
How Blood Pressure Works
https://www.youtube.com/watch?v=Ab9OZsDECZw
Blood Pressure- The force exerted on the walls of blood vessels by the blood flowing through
them
Systolic Pressure- When the heart is contacting, the arteries are pushed to their widest as the
blood pumps through them- when blood pressure is highest
120mm Hg
Diastolic Pressure- When the heart is relaxing, the arteries return to their original state and width-
when blood pressure is lowest
80 mm Hg
MAP- Mean Arterial Pressure, an average of the two pressures
Vasodilation- Widening of the veins to increase surface area. Also decreases blood pressure as
there is less force on the vessel walls
Vasoconstriction- Narrowing of the veins to decrease surface area. Increases blood pressure as
there is more force on vessel walls
What blood vessels are being used?
Mandibular artery- below jaw
Cephalic- Front leg
Dorsal Pedal- Top of foot
Jugular- Neck
Arteries:
Can measure pulse and blood pressure
Deeper than veins
Will bleed more than a vein if cut
Why do we need it?
Blood supply is a transport medium
Oxygen
Energy/nutrients
Waste products
Cells for repair/defense
Temperature regulation
Conserve/release heat
How Blood Pressure Works
https://www.youtube.com/watch?v=Ab9OZsDECZw
Blood Pressure- The force exerted on the walls of blood vessels by the blood flowing through
them
Systolic Pressure- When the heart is contacting, the arteries are pushed to their widest as the
blood pumps through them- when blood pressure is highest
120mm Hg
Diastolic Pressure- When the heart is relaxing, the arteries return to their original state and width-
when blood pressure is lowest
80 mm Hg
MAP- Mean Arterial Pressure, an average of the two pressures
Vasodilation- Widening of the veins to increase surface area. Also decreases blood pressure as
there is less force on the vessel walls
Vasoconstriction- Narrowing of the veins to decrease surface area. Increases blood pressure as
there is more force on vessel walls
What blood vessels are being used?
Mandibular artery- below jaw
Cephalic- Front leg
Dorsal Pedal- Top of foot
Jugular- Neck
Arteries:
Can measure pulse and blood pressure
Deeper than veins
Will bleed more than a vein if cut
