TEAS A&P Cardiovascular System

Functions of Blood

Maintain homeostasis, transport hormones, nutrients and gas

What does blood consist of?

Plasma, erthrocytes and platelets

Arteries

carry blood away from the heart

Veins

Carry blood back to the heart

Capillaries

Site of gas exchange

Atria

thin wall, upper chambers that receive blood from circulatory system

Ventricle

thick wall, lower chambers that pump blood out to the lungs and the rest of the body

Blood flow of deoxygenated blood; Right side

Body→ Superior/Inferior Vena Cava→Right Atrium→ Tricuspid Valve→ Right Ventricle→ Pulmonary Valve→ Pulmonary Artery→ Lungs

Blood flow of oxygenated blood; Left Side

Lungs→ Pulmonary Vein→Left Atrium→Mitral Valve→ Left Ventricle→ Aortic Valve→ Aorta→ Body

Coronary Arteries

Originate from the aorta and delivers nutrients and oxygen to heart

Coronary Veins

deoxygenated blood returns to right atrium from coronary sinus

Electrical Conduction Pneumonic Device

Strong: SA Node, 60-100 BPM, Primary

Arteries: AV Node, 40-60 BPM, Secondary

Benefits Bodies: Bundle of HIS

Performance: Purkinje Fibers, 20-40 BPM, Last

Sinoatrial Node (SA)

main pacemaker, triggers atrial contractions and electrical impulse. Primary Pacemaker, 60-100BPM

Bachmann Bundle

transmit high speed signals from SA to left atrium

Intermodial Pathway

interior, middle, posterior, signals from SA→AV

Atrioventricular Node

Delay signal from SA node allowing Atria to contract and fill venricles. Secondary pacemaker, 40-60BPM

Bundle of HIS

route between atria and ventricle. Right signals right ventricle and Left signals left ventricle

Purkinje Fibers

Project from right and left connecting myocytes and initialize depolarization to contract. Last pacemaker, 20-40 BPM

ECG Basics

Isoelectrical Line,P Wave, QRS Complex, and Systolic BP

Isoelectrical Line

Critical Baseline

P Wave

Atrial Depolarization, atrial contraction

QRS Complex

Ventricular depolarization, ventrical contraction

T Wave

ventricular repolarization, ventricular relaxation

Depolarization

Contraction

Repolarization

relaxation

Systolic BP

contraction of the heart, peak pressure in arteries, lub sound, top number, lower than 120

Diastolic BP

relaxation of the heart, lowest pressure in arteries, dub sound, bottom number, lower than 80