Self Guide Self Test LAB 10 Flashcards
When taking a blood pressure, the first sound that you hear represents the _____, and is the pressure that is generated during _____.
Group of answer choices
a) systolic reading; relaxation of the ventricle
b) systolic reading; contraction of the ventricles
c) diastolic reading; contraction of the atria
d) diastolic reading; relaxation of the ventricles
systolic reading; contraction of the ventricles
Mean arterial pressure must be homeostatically maintained
(multiple answers)
a) to insure adequate perfusion of all vascular beds.
b) to insure sufficient pressure so that the forces of gravity can be overcome.
c) to prevent one from passing out if the brain is insufficiently perfused.
d) to allow one to change positions such as going from reclining to standing without feeling faint.
e) through the baroreceptor reflex.
ALL CORRECT
As the heart to brain distance becomes greater, the MAP (mean atrial pressure) at the level of the heart _____ , while the MAP at brain level _____ when compared with different species.
a) decreases; decreases
b) decreases; increases
c) decreases; remains about the same
d) increases; decreases
e) increases; increases
f) increases; remains about the same
f) increases; remains about the same
Which of the following formulas is correct?
(multiple answers)
c) Mean arterial pressure = cardiac output X peripheral resistance
d) Mean arterial pressure = stroke volume X heart rate X peripheral resistance
f) Mean arterial pressure = [(systolic pressure - diastolic pressure)/3] + diastolic pressure
C,D,F
Your subject has the following experimental data:
(1) heart rate of 66 beats per minute,
(2) a stroke volume of 73 milliliters per beat, and
(3) a peripheral resistance of 21 mm Hg . minute per liter.
Calculate their mean arterial pressure. Record your answer to the nearest whole number. For full credit you must include the appropriate units with your answer. HINT: Write out the needed formulas, and cross out the units to make sure you are doing the calculations correctly. You will need to convert the cardiac output from milliliters/minute to liters per minute before calculating Mean Arterial Pressure.
101
The formula for this question is Cardiac Output X Peripheral Resistance. You must first calculate Cardiac Output from Heart Rate X Stroke Volume and use the value in liters per minute to calculate MAP.
Given a systolic pressure of 155 mm Hg and a diastolic pressure of 71 mm Hg, calculate the mean arterial pressure (MAP) for a subject. Record your answer to the nearest whole number. Also include the units for MAP. HINT: If you do not know where to find the formula to answer this question, refer to the Experiment #10 index in your Lab Manual.
99
The formula for this question is MAP = [(PS-PD) / 3] + PD
Systolic blood pressure is reflected or influenced by _____, whereas diastolic pressure is reflected by _____.
heart rate; stroke volume
peripheral resistance; cardiac output
cardiac output; heart rate
cardiac output; peripheral resistance
cardiac output; peripheral resistance
You are measuring the blood pressure in a patient using a sphygmomanometer. You could detect an increase in venoconstriction by observing _____________, and you could detect an increase in vasoconstriction of the arterioles by observing ______________.
a decrease in systolic pressure; an increase in diastolic pressure
an increase in diastolic pressure; an increase in diastolic pressure
an decrease in diastolic pressure; a decrease systolic pressure
an increase in systolic pressure; an increase in diastolic pressure
an increase in systolic pressure; an increase in diastolic pressure
If heart rate doubles and stroke volume doubles, cardiac output will:
double (2X).
quadruple (4X).
stay the same.
reduce to one-half (1/2)
quadruple (4X).
Your subject has the following experimental data: (1) heart rate of 70 beats per minute (2) stroke volume of 74 ml /beat. Calculate his/her cardiac output in liters/minute. Record your answer to the nearest 1/10.
5.2
The correct formula for this questions is: Cardiac Output = Heart Rate X Stroke Volume.
Which of the following factors can affect stroke volume?
(Multiple answers)
end diastolic volume
venous return
heart rate
ejection fraction
ventilation
exercise
sympathetic stimulation
everything
What principle does the following graph represent?
Reflex control of the heart, which is modified by the autonomic nervous system.
Increased venous return stimulates stretch receptors in the myocardium, thereby eliciting an increase in sympathetic stimulation of the heart.
Starling’s Law, which is an intrinsic autoregulation mechanism that matches cardiac output to venous return.
None of the above are true.
Starling’s Law, which is an intrinsic autoregulation mechanism that matches cardiac output to venous return.
Which of the following statements is/are true?
(multiple answers)
In the reclining position, gravity has little influence on blood pressure homeostasis.
In the standing position, blood tends to pool in the extremities.
Venous return decreases when one moves from a reclining to a standing position.
The baroreceptor reflex is responsible for adjusting mean arterial pressure on a moment to moment basis.
Everything.
Venous valves
(multiple answers)
prevent blood from pooling in the extremities.
assist in reducing the effect of hydrostatic pressure on blood returning to the heart.
when impaired are the cause of varicose veins.
everything
List three mechanisms the body has developed to maintain the return of blood (venous return) to the heart from the extremities. __________
(three words)
____________ (two words) ___________
(one word). Use the same order as these mechanisms are presented in the Lab Manual and Lecture Notes.
Three words: Skeletal muscle pump
Two words: Thoracic pump
One word: Venoconstriction
Which of the following facilitates venous return?
(multiple answers)
increase in venous tone
skeletal muscle pump
thoracic pump
postural changes such as lying down with feet elevated
fainting
everything
