phy

[ronu24]

if v give nor-adrenaline to pt then......

SP INCREASE DP INCREASE
SP DECREASE DP DECREASE
SP INCREASE DP DECREASE
SP DECREASE DP INCREASE [sp=systolic pressure, dp diastolic pressure]

---

Members don't see this ad.

 

[dreamchaser]

Sp increase dp increase

 

[missiondds]

if v give nor-adrenaline to pt then......

SP INCREASE DP INCREASE
SP DECREASE DP DECREASE
SP INCREASE DP DECREASE
SP DECREASE DP INCREASE [sp=systolic pressure, dp diastolic pressure]

NE acts on alpa 1receptors on skin n splanic viscera to cause vasoconstriction /ARTERIOLAR CONSTRICTRION->increase BP WHICH IS BOTH SP N DP.

 

[ronu24]

NE acts on alpa 1receptors on skin n splanic viscera to cause vasoconstriction /ARTERIOLAR CONSTRICTRION->increase BP WHICH IS BOTH SP N DP.

thanks for explanation

 

[dreamchaser]

When moving from a supine to an erect position:
A. Mean arterial pressure increases
B. Skin perfusion immediately decreases
C. Decreased renin-angiotensin II
D. Cardiac output increases
E. Increased ADH secretion
F. TPR increases

 

[missiondds]

When moving from a supine to an erect position:
A. Mean arterial pressure increases
B. Skin perfusion immediately decreases
C. Decreased renin-angiotensin II
D. Cardiac output increases
E. Increased ADH secretion
F. TPR increases

answer cardiac output increase

 

[dreamchaser]

When moving from a supine to an erect position:
A. Mean arterial pressure increases – No, slightly lower initially then normal
B. Skin perfusion immediately decreases – While it does decrease rapidly… nothing is really immediate
C. Decreased renin-angiotensin II – No, increased
D. Cardiac output increases – No, decreases
E. Increased ADH secretion – Yes, but slower response than (F)?
F. TPR increases – Correct

 

[missiondds]

When moving from a supine to an erect position:
A. Mean arterial pressure increases – No, slightly lower initially then normal
B. Skin perfusion immediately decreases – While it does decrease rapidly… nothing is really immediate
C. Decreased renin-angiotensin II – No, increased
D. Cardiac output increases – No, decreases
E. Increased ADH secretion – Yes, but slower response than (F)?
F. TPR increases – Correct

when a person moves from a supine position to erect position...

peripheral pooling of blood-----> decrease in venous returns/sv also decreses----------> decrease in cardiac output----------> decrease in bp----> decrease in firing of baroreceptors-------->REFLEX SYMPATHETIC STIMULATION---------->INCREASE IN CARDIAC OUTPUT AND RESTORATION OF BLOOD FLOW/INCREASE IN CONTRALITRY/INCREASE IN EJECTION FACTOR.

 

[dreamchaser]

The main event that takes place immediately after standing is shifting of large volume of blood to lower extremities' veins. This happens because the gravity increases the pressure force in all parts of the body below the heart which help in pooling of blood to lower extremities---->which means TPR decreases initially

http://en.wikipedia.org/wiki/CVS_adjustments_during_postural_changes

 

[missiondds]

the main event that takes place immediately after standing is shifting of large volume of blood to lower extremities’ veins. This happens because the gravity increases the pressure force in all parts of the body below the heart which help in pooling of blood to lower extremities---->which means tpr decreases initially

http://en.wikipedia.org/wiki/cvs_adjustments_during_postural_changes

i dont understand the aim of the question... If it is asking bout the restorative mechanisms to maintain bf after standing then the answer is increased sympathetic stimulation refelx which increases the co and also the tpr.

But if it aims at asking the intial event immediately after standing up thn tpr decreases and co decreases(bfor reflex sym stimulation).

 

[dreamchaser]

i have not made this qun myself just copy pasted here from some site wd ans
so ans is not wrong. by posting here i read alot about this
restorative mechanisms is not mentioned in qun so we should ans according to immediate effect after standing

 

[dreamchaser]

Which one of the following (does/does not) cause (an increased/ a decreased) heart rate?
A. Bainbridge reflex
B. Carotid chemoreflex
C. Bezold-Jarisch reflex
D. Hering-Breuer reflex
E. Cushing reflex
F. Pulmonary chemoreflex


The velocity of blood flow is greatest in:
A. Capillaries
B. Pulmonary vein during diastole
C. Small arteries
D. Inferior vena cava

 

[smyle32]

1) Bainbridge reflex, increases the heart rate and strength of contraction and COP .
2)I think the answer is inferior venecava..
Flow is inversely proportional to the resistance of a vessel.I guess inferior venecava has low resistance,since it has larger diameter when compared to all other choices...well...not sure though... plz correct me if i am wrong

 

[missiondds]

which one of the following (does/does not) cause (an increased/ a decreased) heart rate?
A. Bainbridge reflex ( bradycardia)
b. Carotid chemoreflex (tachycardia)
c. Bezold-jarisch reflex ( never heard)
d. Hering-breuer reflex ( tachycardia)
e. Cushing reflex ( bradycardia.. Restotative mexhanism)
f. Pulmonary chemoreflex( never heard of iths)


the velocity of blood flow is greatest in:
A. Capillaries
b. Pulmonary vein during diastole
c. Small arteries ( answer)
d. Inferior vena cava

lemme know.. Pls post answers

 

[aerotor11]

lemme know.. Pls post answers

the velocity of blood flow is greatest in:
A. Capillaries
b. Pulmonary vein during diastole
c. Small arteries
d. Inferior vena cava(answer)

velocity of blood flow is inversely related to cross sectional area....

the velocity of bloodflow frm highest to lowest wuld be....
aorta>vena cava>large veins>small arteries>arterioles>capillaries....


I hope this helps

 

[dreamchaser]

Which one of the following (does/does not) cause (an increased/ a decreased) heart rate?
A. Bainbridge reflex – INCREASES heart rate (in response to atrial stretch & increased blood volume)
B. Carotid chemoreflex – INCREASES heart rate (in response to low pO2 or pH)
C. Bezold-Jarisch reflex – DECREASES heart rate (in response to direct noxious stimuli to ventricular
mechanoreceptors)
D. Hering-Breuer reflex – This has nothing to do with the heart (it is to do with pulmonary stretch receptors)
E. Cushing reflex – INCREASES heart rate initially (in response to cerebral ischaemia from increased ICP)
then BRADYCARDIA from baroreceptor stimuli
F. Pulmonary chemoreflex – DECREASES heart rate by stimulation of lung vessels -> Tachypnoea ->
Apnoea -> bradycardia

The velocity of blood flow is greatest in:
A. Capillaries – No, linear velocity is the slowest here
B. Pulmonary vein during diastole – Probably the most correct
C. Small arteries – No, this is where it starts to drop off
D. Inferior vena cava – No, as some of the flow is missing

its not in inferior vena cava as diameter is large n blood reaches heart with help of valves against gravity
pulmonary vein transfer blood from lungs to LA n there is obstraction n even heart act as suction pump....so most correct ans is pulmonary vein

 

[missiondds]

Which one of the following (does/does not) cause (an increased/ a decreased) heart rate?
A. Bainbridge reflex – INCREASES heart rate (in response to atrial stretch & increased blood volume)
B. Carotid chemoreflex – INCREASES heart rate (in response to low pO2 or pH)
C. Bezold-Jarisch reflex – DECREASES heart rate (in response to direct noxious stimuli to ventricular
mechanoreceptors)
D. Hering-Breuer reflex – This has nothing to do with the heart (it is to do with pulmonary stretch receptors)
E. Cushing reflex – INCREASES heart rate initially (in response to cerebral ischaemia from increased ICP)
then BRADYCARDIA from baroreceptor stimuli
F. Pulmonary chemoreflex – DECREASES heart rate by stimulation of lung vessels -> Tachypnoea ->
Apnoea -> bradycardia

The velocity of blood flow is greatest in:
A. Capillaries – No, linear velocity is the slowest here
B. Pulmonary vein during diastole – Probably the most correct
C. Small arteries – No, this is where it starts to drop off
D. Inferior vena cava – No, as some of the flow is missing

its not in inferior vena cava as diameter is large n blood reaches heart with help of valves against gravity
pulmonary vein transfer blood from lungs to LA n there is obstraction n even heart act as suction pump....so most correct ans is pulmonary vein

brain bridge causes techycardia.. sorry bout the typo error..
hering burer refelx is associated with pulmonary strech receptors but prolonged strech stimulus ll cause elevated heart rate.pls check wiki..


Thus, an increase in pulmonary stretch receptor activity ( in hering burer reflex)leads to inhibition of the CVMs and an elevation of heart rate (tachycardia). This is a normal occurrence in healthy individuals and is known as sinus arrhythmia.. directly frm wiki

 

[missiondds]

hering burer refelx is associated with pulmonary strech receptors but prolonged strech stimulus ll cause elevated heart rate.pls check wiki..

http://en.wikipedia.org/wiki/Hering-Breuer_reflex

 

[missiondds]

Which one of the following (does/does not) cause (an increased/ a decreased) heart rate?
A. Bainbridge reflex – INCREASES heart rate (in response to atrial stretch & increased blood volume)
B. Carotid chemoreflex – INCREASES heart rate (in response to low pO2 or pH)
C. Bezold-Jarisch reflex – DECREASES heart rate (in response to direct noxious stimuli to ventricular
mechanoreceptors)
D. Hering-Breuer reflex – This has nothing to do with the heart (it is to do with pulmonary stretch receptors)
E. Cushing reflex – INCREASES heart rate initially (in response to cerebral ischaemia from increased ICP)
then BRADYCARDIA from baroreceptor stimuli
F. Pulmonary chemoreflex – DECREASES heart rate by stimulation of lung vessels -> Tachypnoea ->
Apnoea -> bradycardia

The velocity of blood flow is greatest in:
A. Capillaries – No, linear velocity is the slowest here
B. Pulmonary vein during diastole – Probably the most correct
C. Small arteries – No, this is where it starts to drop off
D. Inferior vena cava – No, as some of the flow is missing

its not in inferior vena cava as diameter is large n blood reaches heart with help of valves against gravity
pulmonary vein transfer blood from lungs to LA n there is obstraction n even heart act as suction pump....so most correct ans is pulmonary vein

are these answers definative or is it your educated guess?..

 

[dreamchaser]

these r definitive ans wd reference dont wry....
but its always gud to discuss about choices,help in elaboration of topic
keep it up..............
n about hering burer refelx u r right as u said prolonged strech stimulus ll cause elevated heart rate but other factor directly effect heart rate even wd slight stimulation