Aphy 201 Exam 5 Questions with Correct Answers
Question 1:
How does resistance affect flow?
Answer:
pressure are inversely related
Question 2:
List and explain three factors that affect resistance
smaller the diameter the greater the resistance and the slower the flow.
Vasodilation
an increase in blood vessel diameter Vasoconstriction
a decrease in blood vessels diameter flow rate
the volume of blood that passes a given point in the system per unit time
Answer:
Flow is inversely proportional to resistance
-Viscosity of the fluid: the more viscous the fluid the more resistance and the slower the flow.
-Length of vessels: the longer the vessels the greater the resistance and slower the flow.
-Diameter of the vessels: The greater the diameter the less the resistance and the faster the
flow. The
Question 3:
Measures how fast blood flows past a certain point MAP
the driving force for blood flow autorhythmic
smaller, not organized with sarcomeres myocardial cells
Answer:
velocity of low
typical striated muscle cell, intercalated disks, gap junctions, desmosomes, one-third of the cell
is filled
Question 4:
Why is it important that the myocardial cells do not reach tetanus and how is this prevented?
Answer:
with mitochondria, less SR, extracellular Ca++ initiates the contraction
The refractory period lasts almost as long as the muscle contraction to prevent tetanus from
happening. Cardiac muscle cell have to relax so the ventricles can refill and more blood can be
pumped.
, Question 5:
What do the peaks of an ECG represent?
-P wave: Atria depolarize
-QRS complex: Ventricles depolarize and the atria repolarize
Answer:
-AV node delay: the signal is delayed here so the atria can contract
Question 6:
Early ventricular contraction and the first heart sound: The ventricles depolarize and the
contraction
Answer:
Be able to describe the cardiac cycle in detail
begins from the apex and works it way up. As the ventricle contract the volume inside the
ventricle decreases and the pressure inside the ventricle increases. The forces blood up toward
the atria and closes the AV valves. The closing of the AV valves makes the first heart sound.
Both sets of valves (AV and Semilunar) are now closed so the volume of blood does not change.
A time referred to as isovolumic
Question 7:
Ventricular relaxation and the second heart sound: the heart contraction ends and the
ventricles relax.
Diastole
relaxation (ventricular) Systole
Contraction (ventricular) CO
the volume of blood pumped by one ventricle in a given period of time. SV
Answer:
ventricular contraction.
Their volume increase and the pressure decreases. Blood flows back toward the heart, closing
the semilunar valves. This is the second heart sound. Right now both sets of valves are closed so
there is not
Question 1:
How does resistance affect flow?
Answer:
pressure are inversely related
Question 2:
List and explain three factors that affect resistance
smaller the diameter the greater the resistance and the slower the flow.
Vasodilation
an increase in blood vessel diameter Vasoconstriction
a decrease in blood vessels diameter flow rate
the volume of blood that passes a given point in the system per unit time
Answer:
Flow is inversely proportional to resistance
-Viscosity of the fluid: the more viscous the fluid the more resistance and the slower the flow.
-Length of vessels: the longer the vessels the greater the resistance and slower the flow.
-Diameter of the vessels: The greater the diameter the less the resistance and the faster the
flow. The
Question 3:
Measures how fast blood flows past a certain point MAP
the driving force for blood flow autorhythmic
smaller, not organized with sarcomeres myocardial cells
Answer:
velocity of low
typical striated muscle cell, intercalated disks, gap junctions, desmosomes, one-third of the cell
is filled
Question 4:
Why is it important that the myocardial cells do not reach tetanus and how is this prevented?
Answer:
with mitochondria, less SR, extracellular Ca++ initiates the contraction
The refractory period lasts almost as long as the muscle contraction to prevent tetanus from
happening. Cardiac muscle cell have to relax so the ventricles can refill and more blood can be
pumped.
, Question 5:
What do the peaks of an ECG represent?
-P wave: Atria depolarize
-QRS complex: Ventricles depolarize and the atria repolarize
Answer:
-AV node delay: the signal is delayed here so the atria can contract
Question 6:
Early ventricular contraction and the first heart sound: The ventricles depolarize and the
contraction
Answer:
Be able to describe the cardiac cycle in detail
begins from the apex and works it way up. As the ventricle contract the volume inside the
ventricle decreases and the pressure inside the ventricle increases. The forces blood up toward
the atria and closes the AV valves. The closing of the AV valves makes the first heart sound.
Both sets of valves (AV and Semilunar) are now closed so the volume of blood does not change.
A time referred to as isovolumic
Question 7:
Ventricular relaxation and the second heart sound: the heart contraction ends and the
ventricles relax.
Diastole
relaxation (ventricular) Systole
Contraction (ventricular) CO
the volume of blood pumped by one ventricle in a given period of time. SV
Answer:
ventricular contraction.
Their volume increase and the pressure decreases. Blood flows back toward the heart, closing
the semilunar valves. This is the second heart sound. Right now both sets of valves are closed so
there is not
