circulatory system

Atria

receive blood from the body and lungs, pushing it into the ventricles

Ventricle

pump blood out of the heart to the lungs and body

Tricuspid valve

has 3 flaps, blood flows from the RA to the RV but not backwards

Bicuspid (mitral) valve

2 flaps, blood flows from LA to LV but not backwards

Systolic

highest # when ventricles contract

Diastolic

lowest # when ventricles relax

Heart attack

heart continues beating, a circulation problem, blocked artery: prevents O2 from myocardium

Cardiac arrest

heart stops beating, an electrical problem, irregular heartbeat: fibrillation

Pericarditis

Inflammation results in increased production of fluid restricting heart movement

Myocardium

heart muscle

Arteries

carry high-pressure, oxygenated blood away from the heart to tissues

Veins

return low-pressure, deoxygenated blood to the heart, using valves to prevent backflow

Stroke

Aneurysm in the brain

Aneurysm

A bulge in the weakened wall of a blood vessel (usually an artery) or heart chamber

Bainbridge Reflex

When the pressure of blood increases in the RA, it causes the heart rate to increase

Describe heart features specific to fetal circulation and function

Foramen ovale

Ductus arteriosus

What creates the “lub” “dub” sound of the heart?

Lub- when tricuspid and bicuspid (mitral) valves close

Dub- semilunar valves close

Describe how the heartbeat is controlled

The heartbeat is controlled by an electrical conduction system that initiates and spreads impulses through the heart muscle, conveys impulse from the AV node to the Purkinje fibers

What is an ECG and the P, QRS, & T parts to it?

ECG- Measurement of the heart’s electrical activity

P wave- when atria contract

QRS- ventricles contract

T wave- recovery of ventricles

What is normal blood pressure and its danger levels?

120/80

Hypotension: <90/<60

Hypertension: >140/>90

3 health problems from having high blood pressure.

heart attack, stroke, kidney failure