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BIOS 255 MIDTERM/FINALS QUESTIONS AND ANSWERS

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bios 255 midtermfinals
atriovenous anastomosis
resistance
capillaries surrounding the choroid plexus is of w
blood flows toward the heart in the veins by
blood volume is decreased by what two hormones

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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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