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
THORATIC CAVITY
chamber within the chest that contains the heart and lungs
MEDIASTINUM
the space in the chest between the lungs that contains all of the internal organs of the chest except the lungs
CARDIAC MUSCLE
muscle of the heart
SKELETAL MUSCLE
the type of muscle tissue that connects to the bones and generates the force that creates movement
SMOOTH MUSCLE
an involuntary non striated 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
superior chambers 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 beats per minute while the heart is at complete rest (average RHR is 60-100 bpm)
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
the measurement of the number of times a heart beats within a specified time
BRADYCARDIA
when heart rate is less than 60 BPM
TACHYCARDIA
when heart rate is higher than 100 BPM
CARDIAC OUTPUT (Q)
the overall performance of the heart (heart rate x stroke volume)
GROWTH FACTORS
substances within the blood that attach to cells, aid in growth and development and help with healing after an injury
WHAT 3 TYPES OF CELLS ARE IN BLOOD?
red, white, and platelets
WHAT DO RED BLOOD CELLS DO?
carry oxygen from lungs throughout the body
WHAT DO WHITE BLOOD CELLS DO?
help fight infections
WHAT DO PLATELETS HELP WITH?
blood clotting and healing after injury
WHAT ARE THE SUPPORT MECHANISMS OF BLOOD?
transportation, regulation, protection
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 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 allow 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.
BLOOD PRESSURE (BP)
The outward pressure exerted by the blood on the vessel walls; reported as systolic/ diastolic.
PERIPHERAL RESISTANCE
the amount of resistance in the arteries that must be overcome for the blood to flow