Principles of Biomedical Sciences PLTW- semester 1
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PLTW BioMed unit 4
SA (sonoatrial) node - ANS-Pacemaker that sets timing of the heart caused by electrical
impulses from the brain
AV (atrioventricular) node - ANS-Causes atrium to contract after a .1sec delay to let blood travel
through the atria after the first heart contraction
Purkinje fibers - ANS-Signals apex to pump blood after first two small electrical impulses
Autonomic nervous system - ANS-Electrical impulses created by
Sympathetic nervous system - ANS-Speeds up autonomic nervous system
Parasympathetic nervous system - ANS-Slows down autonomic nervous system
too much hormones - ANS-speeds up heart rate
Radial pulse - ANS-Manually taken heart rate (wrist)
Coradid pulse - ANS-Manually taken heart rate (artery or neck)
Low heart rate - ANS-Too little nutrients in tissues caused by
High heart rate - ANS-Heart muscles wear out caused by
Diastole - ANS-Relaxation phase of the heart
Systole - ANS-Contraction phase of the heart
EKG-electrocardiograph - ANS-Electronic recording of the heart's pulse
Arrhythmia - ANS-Irregular heart rate
Angina - ANS-Tissue damage and chest pain
Blood pressure - ANS-Hydrostatic pressure exerting on the walls/pipes of blood vessels
MAP-mean arterial pressure - ANS-Measures adequacy of blood getting through tissues
Cholesterol - ANS-Complex hydrophobic lipid made in the liver and absorbed by intestines from
food
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