circulatory system Flashcards
location of deoxygenated blood
Deoxygenated blood from the body enters the right atrium of the heart and the right ventricle pumps it to the lungs.
location of oxygenated blood
The oxygenated blood returns to the heart, entering the left atrium, while the left ventricle pumps it to the body.
What important protein molecule binds oxygen in the lungs and carries it to the rest of the body?
hemoglobin
hemoglobin
an iron-containing pigment that increases the capacity of the blood to carry oxygen
how many oxygen molecules can be carried by one molecule of hemoglobin
4 oxygen molecules
bradycardia
heart beats very slow
tachycardia
heart rate exceeds 100 beats/minute
normal blood pressure
Normal blood pressure for young adults
= 120 mm Hg (systolic)/80 mm Hg (diastolic)
high blood pressure
Also known as hypertension, is defined as a systolic pressure of 130 mm Hg or higher and a diastolic pressure of 80 mm Hg or higher; The force that blood exerts against the walls of blood
vessel walls
systolic pressure
pressure generated when ventricles contract and push blood away from heart
diastolic pressure
pressure generated when ventricles relax and fill with blood
Sinoatrial (SA) node location
in the wall of right atrium
Sinoatrial (SA) node
(6)
- stimulates muscle cell to contract and relax rhythmically
- Also called pacemaker because it sets the rate of contraction
- This nodal tissue has characteristics of both muscle & nerve.
- When it contracts, it generates electrical impulse.
- The SA node contracts, causing the 2 atria to contract.
- As atria contract signal reaches A 2nd node, the atrioventricular (AV) node
Atrioventricular (AV) node location
located at the base of the interatrial septum
Atrioventricular (AV) node
*Transmits electrical signal to a bundle of His which are related to purkinje fibers and this initiates the contraction of both ventricles.
