Chapter 6: the Cardiorespiratory, Endocrine, and Digestive Systems Flashcards
A system of the body composed of the heart, blood, blood vessels, lungs and airways
Cardiorespiratory System
A system of the body, also known as the circulatory system, that transports blood to tissues of the body
Cardiovascular system
Chamber within the chest that contains the heart and lungs
Thoracic Cavity
The space in the chest between the lungs that contains all the internal organs of the chest (e.g. heart, esophagus) except the lungs
Mediastinum
Muscle of the heart
Cardiac muscle
The type of muscle tissue that connects to bones and generates the forces that create movement
Skeletal Muscle
An involuntary non striated muscle type that is found in organs
Smooth muscle
The contractile components of a muscle cell; the myofilaments (actin and myosin) are contained within myofibril
Myofibrils
The structural unit of a myofibril, composed of actin and myosin filaments between two z-lines
Sarcomere
Superior chambers of the heart that gathers blood returning to the heart
Atrium (Atria)
Inferior chamber of the heart that pumps blood to the lungs and body
Ventricle
Found in the heart, the formations help hold tighter muscle cells
Intercalated discs
The number of heart beats per minute while at complete rest
Resting heart rate (RHR)
Located in the right atrium, this node initiates an electrical signal that causes the heart to beat
Sinoatrial (SA) node
Located between the atria and ventricles, this node delays the impulse from the sinoatrial node before allowing it to pass to the ventricles
Atrioventricular (AV) node
The amount of blood pumped out of the heart with each contraction
Stroke volume
The filled volume of the ventricle before contraction
Ventricular end-diastolic volume
The volume of blood remaining in the ventricle after ejection
End-systolic volume
The measurement of the number of times a heart beats within a specified time period (usually 1 minute)
Heart rate (HR)
When the heart rate is less than 60 beats per minute
Bradycardia
When the heart rate is greater than 100 beats per minute
Tachycardia
The over performance of the heart (heart rate x stroke volume)
Cardiac output (Q)
Fluid that circulates in the heart, arteries, capillaries, and veins; it carries nutrients and oxygen to all parts of the body and also transports waste products from the body to other compartments or organs for either processing (e.g. liver) or excretion (e.g. kidney)
Blood
Substances within the blood that attach to cells, aid in growth and development, and help with healing after injury
Growth factors
Cells within the body that divide and develop into specialized cells, such as brain cells, heart cells and bone cells
Stem cells
Network of hollow tubes that circulates blood throughout the body
Blood vessels
Vessels that transport blood away from the heart
Arteries
The smallest blood vessels and the site of exchange of elements between the blood and the tissues
Capillaries
Vessels that transport blood back to the heart
Veins
Small arteries that eventually divide into capillaries
Arterioles
Small veins that allow blood to drain from capillaries into the larger veins
Venules
The formation of new capillaries
Vasculogenesis
The formation of new capillaries from existing blood vessels
Angiogenesis
The accumulation of blood into the extremities due to slow blood flow through the veins (venous return) or backflow
Venous Pooling