Week 2- Module 3 Flashcards
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.
Mediastinum
The space in the chest between the lungs that contains all the internal organs of the chest except
the lungs.
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 of the heart.
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
Atrium
The superior chambers of the heart that receive blood from the veins and force it into the ventricles
Ventricle
The inferior chambers of the heart that receive blood from the corresponding atrium and force it into the
arteries
Stroke volume
The amount of blood pumped out of the heart with each contraction
Heart rate (HR)
The rate at which the heart pumps; measured in beats per minute (bpm).
Cardiac output (Q)
Heart rate × stroke volume; the overall performance of the heart.
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.
Blood vessels—
—Network of hollow tubes that circulates blood throughout the body
Arteries
—Vessels that transport blood away from the heart.
Capillaries
The smallest blood vessels and the site of exchange of chemicals and water between the blood and
body tissues.
At rest, how much oxygen do humans consume (also known as one metabolic equivalent MET)
3.5mL of oxygen per kilometer of body weight per minute
What is VO2Max?
The maximum amount of oxygen a person can consume and use during a bout of maximal intensity effort
What is the average stroke volume for an adult?
77mL
What is the average heart rate?
70-80 bpm
How do you calculate Cardiac output?
heart rate x stroke volume
What are the 3 functions of blood in the body?
Transportation
Regulation
Protection
What may be the best measure of cardiorespiratory fitness?
a. End-diastolic volume
b. Maximal oxygen consumption
c. Maximal lung capacity
d. Stroke volume
Maximal oxygen consumption
What term describes the number of heart beats per minute and the amount of blood pumped per beat? Select one: a. Heart rate b. Stroke volume c. Cardiac output d. Blood pressure
Cardiac output
Which of the following is a small terminal branch of an artery, which ends in capillaries? Select one: a. Vein b. Arteriole c. Venule d. Atrium
Arteriole
Which term refers to the amount of blood pumped out of the heart with each contraction? Select one: a. Cardiac output b. Stroke volume c. Heart rate d. Radial pulse
Stroke Volume