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