The myocardium receives its blood supply from the coronary veins.
Cardiac muscle has more mitochondria and depends less on a continual supply of oxygen than does skeletal muscle.
Congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues.
Tissues damaged by myocardial infarction are replaced by connective tissue.
The left side of the heart pumps the same volume of blood as the right.
The mitral valve has chordae but the tricuspid valve does not.
An ECG provides direct information about valve function.
The bicuspid valve is located between the left atrium and the left ventricle.
Chordae tendineae prevent the eversion of AV valves.
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 ________.
Blood within the pulmonary veins returns to the ________.
Small muscle masses attached to the chordae tendineae are the ________.
The term for pain associated with deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is ________.
Which of the following factors does not influence heart rate?
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.
Which vessel of the heart receives blood during right ventricular systole?
The layer of the heart responsible for its pumping action is the:
Which of the following is not part of the conduction system of the heart?
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:
The atrioventricular valves close when the:
The initiation of the heart beat is the responsibility of the:
All deoxygenated blood returning from the systemic circulation flows into the:
The adjustment of blood flow to each tissue in proportion to its requirements at any point in time is termed autoregulation.
The outermost layer of a blood vessel is the tunica intima.
Arteries are defined as those vessels that carry oxygenated blood.
Vasodilation is a widening of the lumen due to smooth muscle contraction.
The pulmonary circulation does not directly serve the metabolic needs of body tissues.
An obstruction in the superior vena cava would decrease the flow of blood from the head and neck to the heart.
The walls of arteries are thicker than veins.
All tissues contain capillaries.
An increase in blood viscosity will cause an increase in peripheral resistance.
Which of the following is not one of the three main factors influencing blood pressure?
The function of baroreceptors is to monitor changes in:
Which of the following chemicals does not help regulate blood pressure?
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 ________.
The circulatory route that runs from the digestive tract to the liver is called ________.
hepatic portal circulation
Valves are present in:
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?
The diameter of blood vessels most directly affects:
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