Exam #2
Which statement best describes arteries?
All carry blood away from the heart.
The term for pain associated with efficient, but delivery to the heart that may be caused by the transient spasm of coronary arteries is
Angina pectoris
The P-wave of a normal electrocardio gram indicates________.
Atrial depolarization
If a person were to have substantial blood loss, you would expect to see all of the following psychological events to accept one.
Decreased heart rate
Reduction in the concentration of albumin and blood plasm would alter capillary exchange by
Decreasing colloid osmotic pressure and edema will occur
When viewing a dissected heart is easily to visually discern the right from the last atriums by?
Noticing the thickness of the ventricle walls
Select the correct statement about the heart valves.
The atrioventricular (AV) valves prevent backflow of blood into the atria during ventricular contraction.
Select the correct statement about the function of myocardial cells
The entire heart contracts as a unit or it does not contract at all.
If the vaginal nerves to the heart were cut, the result would be?
The heart rate would increase by about 25 bpm
Histologically the ______________ is squamous epithelium supported by a spares connective tissue layer
Tunica intima
Which of the events below does not occur when a semi lunar valve opens?
Ventricles are in distole
Hemorrhage with a large loss of blood causes
a lowering of blood pressure due to change in cardiac output
Due to the branching of arteries, the type of arteries that would be most numerous would be
arterioles
During a marathon, which of the following hormones, is least likely to be released by the runner?
atrial natriuretic peptide (ANP)
Which of the following is not part of the intrinsic conduction system of the heart?
atrioventricular (AV) valve
During the period of ventricular filling ________.
blood flows mostly passively through the atria and the open AV valves into the ventricles
Norepinephrine acts on the heart by ___________.
causing threshold to be reached more quickly
Normal heart sounds are caused by which of the following events
closure of the heart valves
The source of blood carried to capillaries in the myocardium would be
coronary arteries
If cardiac muscle is deprived of its normal blood supply, damage would primarily result from ________.
decreased delivery of oxygen
Compared to skeletal muscle, cardiac muscle ________.
has gap junctions that allow it to act as a functional syncytium
Which of the choices below reflects the balance, or imbalance between the direction in amount of fluid that flows across the capillary walls
hydrostatic and osmotic pressure
Peripheral resistance ________.
increases as blood viscosity increases
Blood flow to the skin ________.
increases when environmental temperature rises
The second heart sound is heard, during which phase of the cardiac cycle?
isovolumetric relaxation
Blood within the pulmonary veins returns to the ________.
left atrium
Which vessels of the heart receives blood from the right ventricle
pulmonary trunk
The left ventricular wall of the heart is thicker than the right wall in order to
pump blood with greater pressure
The fact that the left ventricle of the heart is thicker than the right ventricle reveals that
pumps blood against a greater resistance
velocity of blood flow is
slowest in the capillaries because the total cross-sectional area is the greatest
If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells
tetanic contractions might occur, which would stop the heart's pumping action
Which of the following would have the least influence on blood pressure?
white blood cell count