Bios 255 Midterm Exam 2023 Which of the typical blood vessels has a thin tunica tunica media dominated by collagen fibers? - Correct Answer veins Capillaries surrounding the choroid plexus is of which type? - Correct Answer Fenestrated capillaries Blood flow through a capillary bed is passed by what structure? - Correct Answer Atriovenous Anastomosis Blood flows toward the heart in the veins by? - Correct Answer -With the aid of contractions of the adjacent skeletal muscles.-Valves in the veins prevent the backflow of the blood -Pressure at the venules is higher than the pressure at the venae cava As the blood flows from venules toward the heart, what increases? - Correct Answer Resistance Blood volume is decreased by what two hormones? - Correct Answer ANP & BNP Which of the following is not a vasoconstrictor?-Prostagladin -Thromboxones -Nitric Oxide - Correct Answer Nitric Oxide Vasodilation is achieved by adrenergic receptors. True or False - Correct Answer False Baroreceptors are found in what sinus? - Correct Answer Carotid Sinuses Which of the typical blood vessels has thick tunica media dominated by smooth muscle cells and elastic fibers? - Correct Answer Arteries 1 / 2
Femoral artery is a type of what artery? - Correct Answer Muscular Artery Capillaries that have a complete lining are called what? - Correct Answer Continuous Capillaries Blood flow through a capillary is regulated by what? - Correct Answer Precapillary Sphincter As the blood flows from the aorta towards the cappilaries what increases? - Correct Answer Resistance Pressure gradient of water causes osmosis. True or False - Correct Answer False Which of the following is NOT a vasodilator? - Correct Answer Prostagladin Venous reserve is used during extreme blood loss. True or False - Correct Answer True Chemoreceptors are found in what? - Correct Answer Aortic Bodies Venous valves allow blood to flow in BOTH directs. True or False. - Correct Answer False The normal heart sounds are caused by what? - Correct Answer The closure of the heart valves The left ventricular wall of the heart is much thicker than the right wall in order to do what? - Correct Answer Pump blood against a greater pressure Ventricular depolarization corresponds to what complex? - Correct Answer QRS Complex Blood within the pulmonary veins returns to the heart in what location? - Correct Answer Left Atrium When the heart rate is at 75, the duration of one cardiac cycle is how long? - Correct Answer 0.8 seconds
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