Cardiorespiratory System A system of the body composed of the cardiovascular and respiratory systems.
Cardiovascular System A system of the body composed of the heart, blood, and blood vessels. Respiratory System A system of organs (the lungs and respiratory passageways) that collects oxygen from the external environment and transports it to the bloodstream.
Heart A hollow muscular organ that pumps a circulation of blood through the body by means of rhythmic contraction. (Contained within the mediastinum) The adult heart is approx the size of an adult fist and weighs roughly 300G
Mediastinum The space in the chest between the lungs that contains all the internal organs of the chest except the lungs.
3 types of muscles- Cardiac, Smooth, Skeletal.
Cardiorespiratory System A system of the body composed of the cardiovascular and respiratory systems. (Striated appearance) more tightly connected than skeletal and involuntary Typical Resting Heart Rate- between 70-80 BPM
Sinoatrial (SA) Node A specialized area of cardiac tissue, located in the right atrium of the heart, which initiates the electrical impulses that determine the heart rate; often termed the pacemaker for the heart. (Located in the Right Atrium)
Atrioventricular (AV) Node A small mass of specialized cardiac muscle fibers, located in the wall of the right atrium of the heart, that receives heartbeat impulses from the sinoatrial node and directs them to the walls of the ventricles. (Conducts impulses to the ventricles through
Perkinje Fibers)
Right side of the heart = pulmonic side. Receives blood from body that is low in O2 and high in
CO2 (deoxygenated) and pumps it into the lungs.
Atria- Located Superiorly, act as a reservoir.

Stroke Volume (SV) The amount of blood pumped out of the heart with each contraction.
(Measured as the different between the ventricular end-diastolic volume (EDV) and the end systolic volume (ESV) In a typical heart, the EDV is about 120 mL of blood and the ESV about 50 mL of blood. The different in these two volumes, 70 mL represents the stroke volume Cardiac Output (Q) Heart rate X(Multiplied by) stroke volume, the overall performance of the heart. (volume of blood pumped by the heart per minute.
Blood Fluid that circulates in the heart, arteries, capillaries, and veins, carries nutrients and oxygen to all parts of the body, and also rids the body of waste products. The Average adult has between 4 and Liters (L) of blood in his/her body.

Blood Vessels Network of hollow tubes that circulates blood throughout the body.
Arteries Vessels that transport blood away from the heart.
Arterioles Small terminal branches of an artery, which end in capillaries.
Capillaries The smallest blood vessels, and the site of exchange of chemicals and water between the blood and the tissues.
Venules The very small veins that connect capillaries to the larger veins.
Veins Vessels that transport blood from the capillaries toward the heart.
When blood leaves the heart it follows: Arteries ⇒ Arterioles ⇒ Capillaries ⇒ Venules ⇒
Veins.

Aorta- The largest artery in the body, which carries blood away from the heart
Respiratory system
Respiratory System A system of organs (the lungs and respiratory passageways) that