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17 Cards in this Set

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THE VENOUS SYSTEM Functions as a collection of blood from capillary beds to transport the blood back to the _____
heart
THE VENOUS SYSTEM is a Blood ______ of the circulation: veins hold about six times the volume contained in the arteries.
reservoir
Venous Compliance (Cv) is about 15 - 20 times ____ than arterial compliance (Ca).
greater
Veins are often called "capacitance vessels", since they can accept greater _____ per increment of pressure than arteries.
volumes
The ______ to the heart is defined as the volume of blood per unit time (ml/min) flowing into either the right atrium or left atrium via systemic or pulmonary veins, respectively.
Venous return (VR)
In the steady state, cardiac output and _______ must be equal.
venous return
The dominant factor influencing venous return is the pressure gradient between the ______ and the _____.
capillaries
atrium
_________ contractions effect venous return by compressing veins, forcing blood toward the heart. Venous valves prevent backf low.
Skeletal muscle
______ results in decreased intrathoracic pressure augments systemic venous return to the right side of the heart.
Inspiration
during _____ systemic venous return to right heart diminishes
Expiration
Extrathoracic veins can temporarily collapse near thoracic entry points, if ______ effort causes venous pressure to become sub-atmospheric.
inspiratory
_____ is the relative state of contraction of venous smooth muscle
Venomotor tone:
Constriction of veins shifts blood _____ the heart
toward
a. Hydrostatic pressure affects arterial and venous blood pressures equally, so _______ pressure for flow is unaffected in the systemic circulation.
driving
Hydrostatic pressure increases venous ______ pressure and degree of distension. In upright postures, blood can accumulate in the veins below the level of the heart and reduce venous return ("venous pooling").
transmural
Venous return is directly proportional to ______
total blood volume
Venous return determines the degree of filling of the ventricles during diastole, and thus the ____ of the myocardial fibers prior to contraction
lengths