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Blood Flow Through the Heart
What do Autorhythmic Fibers do?
Act as a pacemaker.
What does Spontaneous depolarization mean?
pacemaker potential 75 times/minute
What does the Sinoatrial Node Do?
Acts as a natural Pacemaker and initiates over 100 times per second
Does the SA node establish a rhythm for the heart?
What hormones increase heart rate?
Epinephrine norepinephrine and thyroid hormones
EKG waves and their meanings
- P wave- atrial contraction
- QRS- ventricles contract and mask atrial re-polarization
- T - ventricles repolarize
What is systole?
What is diastole?
What does the foramen ovale do?
In the fetal heart it takes blood from the lungs between the right and left atria
What does ductus arteriosis do?
Shunts blood from pulmonary trunk to aorta in the fetal heart.
What supplies the heart with blood?
What is stroke volume?
volume of blood pumped per beat
What is cardiac output?
amount of blood circulated in one minute
What increases cardiac output?
The amount of BPM
What is a normal heart rate?
What does the right atrium do?
Receives deoxygenated blood from the vena cava to send through the tv into the right ventricle
Is plasma mostly water?
What do neutrophils do?
Leukocytes that fight against bacteria and are the most numerous
What do eosinophils do?
Release histaminase (allergies) and attack parasitic worms
What do T Cells do?
What are the blood types and their compatabilities?
- AB-universal recipient
- O-universal donor
- most people are Rh +
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