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