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Which tunic of an artery is most responsible for maintaining blood pressure and continuous blood circulation?
Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary function of ______
A precapillary sphincter is a cuff of smooth muscle that regulates the flow of blood into the capillaries. True or False
Why is it important that blood pressure drop to lower levels as it reaches the capillary beds?
Capillaries are fragile and extremely permeable
Which of the following is directly involved in long-term blood pressure regulation?
Which of the following would not move by diffusion across a capillary into the surrounding tissue?
Arteries supplying the same territory are often merged with one another, forming arterial anastomoses. True or False
The baroreceptors in the carotid sinus and aortic arch are sensitive to which of the following?
Changes in arterial pressure
Osmotic pressure is created by the presence in a fluid of small diffusible molecules that easily move through the capillary membrane. True or False
The circulatory route that runs from the digestive tract to the liver is called ________.
Hepatic portal circulation
Arterial pressure in the pulmonary circulation is much higher than in the systemic circulation because of its proximity to the heart. True or False
What do the ductus arteriosus and the foramen ovale become at birth?
ligamentum arteriosum; fossa ovalis
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