anatomy chapter 22 quiz
Of the four "normal" heart sounds, the initial "lubb" sound is heard when the
AV valves close.
The left atrium and left ventricle are part of which circuit of the cardiovascular system?
Systemic circuit
Which are differences between cardiac muscle tissue and skeletal muscle tissue?a: The sarcoplasmic reticulum in cardiac muscle is less extensive.b: The sarcoplasmic reticulum in cardiac muscle is more organized.c: Cardiac muscle has intercalated discs; skeletal muscle does not.d: Cardiac muscle has 1 or 2 nuclei per cell; skeletal muscle has multiple nuclei per cell.e: Cardiac muscle has more well-defined terminal cisternae.
a, c, d
It is the _____________ that permits the compression necessary to pump large volumes of blood out of the ventricles.
arrangement of cardiac muscle in the heart wall
In an EKG, the P wave is generated when the
atria depolarize.
The left and right coronary arteries travel within the
coronary sulcus.
The inferior chambers of the heart are the
ventricles.
The epicardium is another name for the
visceral layer of the serous pericardium.
During a cardiac cycle, how many of the four chambers contract at any one time?
2
Which correctly describes the heart's apex?
Projects slightly anteroinferiorly toward the left side of the body
Which of the cardiovascular system's circuits has deoxygenated blood in its arteries?
Pulmonary circuit
Which carries oxygenated blood from the lungs to the heart?
Pulmonary veins
Which circuit of the cardiovascular system is responsible for sending blood to the kidneys, stomach, and pelvic regions?
Systemic circuit
Sympathetic innervation of the heart arises from the ________ segments of the spinal cord.
T1−T5
The foramen ovale is actually an opening in the
interatrial septum.
The cell-to-cell contacts of the cardiac muscle fibers are called
intercalated discs.
Development of the heart commences in the _______ week.
third
Which heart chambers pump deoxygenated blood?
Right atrium and right ventricle
The function of the coronary sinus is to
take blood from the coronary circulation to the right atrium.
During ventricular systole
the semilunar valves open and the AV valves close.
Which valve prevents the backflow of blood into the left ventricle when the ventricles relax?
Aortic semilunar valve
Which action causes the closure of the right atrioventricular valve?
Contraction of the right ventricle
Which may predispose one to inadequate coronary blood flow?
Tachycardia
The beginning of the cardiac cycle is when the
atria contract.
In an EKG, the T wave denotes
repolarization of the ventricles.