BIOS 255 MIDTERM/FINALS
Which of the typical blood vessels has a thin tunica tunica media dominated by collagen fibers? - Answer- veins
Capillaries surrounding the choroid plexus is of which type? - Answer- Fenestrated capillaries
Blood flow through a capillary bed is passed by what struct...
BIOS 255 MIDTERM/FINALS
Which of the typical blood vessels has a thin tunica tunica media dominated by
collagen fibers? - Answer- veins
Capillaries surrounding the choroid plexus is of which type? - Answer- Fenestrated
capillaries
Blood flow through a capillary bed is passed by what structure? - Answer-
Atriovenous Anastomosis
Blood flows toward the heart in the veins by? - 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? - Answer-
Resistance
Blood volume is decreased by what two hormones? - Answer- ANP & BNP
Which of the following is not a vasoconstrictor?
-Prostagladin
-Thromboxones
-Nitric Oxide - Answer- Nitric Oxide
Vasodilation is achieved by adrenergic receptors. True or False - Answer- False
Baroreceptors are found in what sinus? - Answer- Carotid Sinuses
Which of the typical blood vessels has thick tunica media dominated by smooth
muscle cells and elastic fibers? - Answer- Arteries
Femoral artery is a type of what artery? - Answer- Muscular Artery
Capillaries that have a complete lining are called what? - Answer- Continuous
Capillaries
Blood flow through a capillary is regulated by what? - Answer- Precapillary Sphincter
As the blood flows from the aorta towards the cappilaries what increases? - Answer-
Resistance
Pressure gradient of water causes osmosis. True or False - Answer- False
Which of the following is NOT a vasodilator? - Answer- Prostagladin
Venous reserve is used during extreme blood loss. True or False - Answer- True
, Chemoreceptors are found in what? - Answer- Aortic Bodies
Venous valves allow blood to flow in BOTH directs. True or False. - Answer- False
The normal heart sounds are caused by what? - 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? - Answer- Pump blood against a greater pressure
Ventricular depolarization corresponds to what complex? - Answer- QRS Complex
Blood within the pulmonary veins returns to the heart in what location? - Answer- Left
Atrium
When the heart rate is at 75, the duration of one cardiac cycle is how long? -
Answer- 0.8 seconds
Cardiac muscle cells are like skeletal muscle cells in that they all have what? -
Answer- Striation
The ascending aorta is connected to the - Answer- Left Ventricle
If the vagus nerve is severed, the result would be that - Answer- The heart rate will
increase
The mitral valve is closed during what? - Answer- During ventricular diastole
What will increase the contractility of the heart muscle? - Answer- Thyroxin,
Epinephrine, & Sympathetic Stimuli
An abnormally fast heart rate is called - Answer- Tachycardia
The specialized tissue in the heart muscle that conducts the ventricular
depolarization are the - Answer- Purkinje fibers
The circulatory needs of the heart muscle is provided by - Answer- the coronary
arteries
Blood within the vena cava returns to the heart at the - Answer- Right atrium
Cardiac muscle cells are unlike skeletal muscle cells in that they do not have -
Answer- Tetanic Contractions
The pulmonary trunk is connected to the - Answer- Right Ventricle
The tricuspid valve is closed during - Answer- ventricular systole
Heart murmurs are - Answer- abnormal heart sounds
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