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