Which of the following statement is correct? select all that apply Dicrotic notc

Question

Which of the following statement is correct? select all that apply Dicrotic notch occurs due to the momentary increase in the aortic blood pressure that occurs when its semilunar valve snap shut in an individual with a heart rate of 80 beats/minute, the length of his cardiac cycle is about 0.75 second aortic valve closes when aortic pressure is higher than ventricular pressure The left ventricle usually pumps more blood due to its thicker and stronger myocardium Heart contraction/relaxation and valve opening/closing are the two factors that promote blood movement through the heart the definition of blood pressure is the pressure exerted by blood against the walls of the b;lood vessels the range of left ventricular pressure is

Explanation / Answer

Q1) Dicrotic notch occurs due to the momentary increase in the aortic blood pressure that occurs when its semilunar valves snap short -

Answer- True.

Explanation- The dicrotic notch is a small and brief increase in arterial blood pressure which, appears when the aortic valves (it is one of the two semilunal valves) closes.

Q2) In an cardiac cycle with a heart rate 80 beats /min. , length of his cardiac cycle is about 0.75sec.

Answer- True.

Explanation- heart beats 80 beats for 60 seconds

so in one second the number of heart beats will be = 80/60= 1.3

time taken for one cardiac cycle is= 60/80= 0.75sec.

Q3) Aortic valve closes when Aortic pressure is higher than ventricular presssure.

Answer- True

Explanation-

Blood always flows from High to Low pressure. When pressure in the ventricle drops below aortic pressure or aortic pressure is higher than ventricular pressure, the semilunar valve shuts. This prevents blood from flowing backward through the heart.

Q4)Left ventricle usually pumps more blood due to its thicker and stronger myocardium.

Answer-True.

explanation-  Ventricle have thicker and stronger myocardium, left ventricle has thicker walls than the right because it pumps blood to most of the body while the right ventricle pumps only to the lungs.

Q5) Heart contraction /relaxation and valve opening and closing are the two factors that promote blood movement through heart.

Answer- True.

Explantion- These are the two factors responsible for movement of blood through heart.pumping of blood through heart occurs by contaction and relaxation , and blood flow is checked by closing and opening of valves , they preveny mixing of pure and impure blood also check backward flow of blood.

Q6) The defination of Blood pressure is the pressure exerted by blood against the walls of blood vessels.

Answer-True.

Explanation- Blood pressure (BP) is the pressure of circulating blood on the walls of blood vessels.

Q7) The range of Left Ventricular pressure is < 5-120 mm of Hg.

Answer- False.

Explanation- Ventricular pressure is the measure of blood pressure within the ventricles of the heart.

Left ventricular pressure is systolic- 100-140.

diastolic is 3-12.

Q8) During the isovolumetric contraction , blood volume in the left ventricle is maximum.

Answer- False.

Explanation-  isovolumetric contraction is a phase which occures in early systole during which the ventricles contract, at this stage the semilunar valves (aortic and pulmonary valves) are closed. Contraction causes ventricular pressures to rise sharply, but as the valves are closed there is no change in the volume.

Q9) Pulse is the pressure surge in an artery occuring during each contraction and relaxation of the right ventricle .

Answer- False.

Explanation- The alternating surges of pressure in an artery occur due to contraction and relaxation of the left ventricle.

Q10) Blood presssure to the palm of your right hand will decrease if you heat your right hand.

Answer- True.

Explanation- Heating causes dilation of blood vessels as a result the blood pressure decreases.Because blood puts less pressure on the walls of blood vessels. When we heat our right hand heat causes blood vessels to expand and it allows more heat to escape through the skin and the blood pressure decreases.

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