Chapter 3: The cardiorespiratory system Important definitions Flashcards
The cardiorespiratory system
Composed of the respiratory and cardiovascular system
The cardiovascular system
Blood vessels, blood, and the heart
Arteries
Carry blood away from the heart to the rest of the body
Veins
Return blood to the heart from the rest of the body
Stroke volume
The amount of blood pumped out the heart with each contraction
Cardiac output
Heart rate × stroke volume
Sinoatrial (SA) node
The “pacemaker” of the heart because it initiates the heartbeat
Typical heart rate for an adult
70-80 BPM
The atriums
The right atrium receives blood coming from the body while the left atrium receives the blood (oxygen-rich) that comes from the lungs and the heart.
The Ventricles
The right ventricle has thinner walls because it only needs to pump blood a short distance back to the heart and the lungs. The left ventricle, on the other hand, has much thicker walls and is a much higher pressure pump because it is required to push blood to the rest of the body.
The functions of blood
Protection
Regulation
Transportation
