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The myocardium receives its blood supply from the coronary veins.

false

Cardiac muscle has more mitochondria and depends less on a continual supply of oxygen than does skeletal muscle.

false

Congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues.

true

Tissues damaged by myocardial infarction are replaced by connective tissue.

true

The left side of the heart pumps the same volume of blood as the right.

true

The mitral valve has chordae but the tricuspid valve does not.

false

An ECG provides direct information about valve function.

false

The bicuspid valve is located between the left atrium and the left ventricle.

true

Chordae tendineae prevent the eversion of AV valves.

true

Normal heart sounds are caused by which of the following events?

closure of the heart valves

Cardiac reserve ________.

can be improved by regular exercise

There is a semilunar valve between the:

right ventricle and the pulmonary trunk.

The left ventricular wall of the heart is thicker than the right wall in order to ________.

pump blood with greater pressure

The P wave of a normal electrocardiogram indicates ________.

atrial depolarization

Blood within the pulmonary veins returns to the ________.

left atrium

Small muscle masses attached to the chordae tendineae are the ________.

papillary muscles

The term for pain associated with deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is ________.

angina pectoris

Which of the following factors does not influence heart rate?

skin color

If cardiac muscle is deprived of its normal blood supply, damage would primarily result from ________.

decreased delivery of oxygen

Cardiac muscle cells are like skeletal muscle cells in that they ________.

have I and A bands

The pericardial cavity ________.

contains a lubricating fluid called serous fluid

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

Foramen ovale ________.

connects the two atria in the fetal heart

The stroke volume for a normal resting heart is ________ ml/beat.

70

Which vessel of the heart receives blood during right ventricular systole?

pulmonary trunk

The layer of the heart responsible for its pumping action is the:

myocardium

Which of the following is not part of the conduction system of the heart?

AV valve

The tricuspid valve is closed ________.

when the ventricle is in systole

When viewing a dissected heart, it is easy to visually discern the right and left ventricles by ________.

noticing the thickness of the ventricle walls

Compared to skeletal muscle, cardiac muscle ________.

has gap junctions (intercalated discs)

The myocardium is made of:

cardiac muscle

The atrioventricular valves close when the:

ventricles contract

The initiation of the heart beat is the responsibility of the:

SA node

All deoxygenated blood returning from the systemic circulation flows into the:

right atrium

The adjustment of blood flow to each tissue in proportion to its requirements at any point in time is termed autoregulation.

true

The outermost layer of a blood vessel is the tunica intima.

false

Arteries are defined as those vessels that carry oxygenated blood.

false

Vasodilation is a widening of the lumen due to smooth muscle contraction.

false

The pulmonary circulation does not directly serve the metabolic needs of body tissues.

true

An obstruction in the superior vena cava would decrease the flow of blood from the head and neck to the heart.

true

The walls of arteries are thicker than veins.

true

All tissues contain capillaries.

false

An increase in blood viscosity will cause an increase in peripheral resistance.

true

Which of the following is not one of the three main factors influencing blood pressure?

emotional state

The function of baroreceptors is to monitor changes in:

blood pressure

Which of the following chemicals does not help regulate blood pressure?

nitric acid

Which statement best describes arteries?

All carry blood away from the heart.

Baroreceptors are located in the:

walls of the aorta and carotid arteries

Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary function of ________.

capillaries

The circulatory route that runs from the digestive tract to the liver is called ________.

hepatic portal circulation

Valves are present in:

veins

Aldosterone will ________.

promote an increase in blood pressure

Venous anastomoses ________.

form more freely than arterial anastomoses

Blood flow to the skin ________.

increases when environmental temperature rises

Select the correct statement about the movement of materials at the capillary level.

Carbon dioxide moves from its production site into the interstitial fluid.

Which tunic of an artery is most responsible for maintaining blood pressure and continuous blood circulation?

tunica media

The diameter of blood vessels most directly affects:

resistance

The form of circulatory shock known as hypovolemic shock is ________.

shock that results from large-scale loss of blood volume, or after severe vomiting or diarrhea

The hepatic portal vein ________.

carries nutrient-rich blood to the liver

The term ductus venosus refers to ________.

a special fetal vessel that allows blood to bypass the liver

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