Circulatory System: Heart

Which of the following membranes are found in the body cavities and have parietal layers that line the cavities and visceral layers that cover the organs?

• Synovial membranes

• Mucous membranes

• Cutaneous membranes

• Serous membranes

• Osseous membranes

Answer explanation

Which of the following is true of cardiac muscle tissue? 

• nonstriated, Z-discs, involuntary

• striated, multinucleated, voluntary

• nonstriated, multinucleated, involuntary

• striated, uninucleated, intercalated discs

• nonstriated, intercalated discs, multinucleated

What are the characteristics of the epicardium?

• Outermost layer

• Composed of elastic fibers and adipose tissue

• Produces pericardial fluid

• Middle layer

• Generates force to pump blood

What are the characteristics of the myocardium?

• Middle layer

• Composed primarily of cardiac muscle tissue

• Innermost layer

• Generates force to pump blood

• Regulates contractility

What are the characteristics of the endocaridum?

• Innermost layer

• Made of cardiac tissue

• Regulates contractility

• Produces pericardial fluid

• Outermost layer

Which chamber of the heart has the thickest myocardium?

• Left ventricle

• Right atrium

• Right ventricle

• Left atrium

• Septum

Select all that apply. Which of the following are functions of the pericardium?

• Prevent the heart from bouncing in the thoracic cavity.​

• Prevent the heart from overfilling with blood.​

• Create a near-frictionless environment through the production of serous fluid.​

• Allow for the movement of blood through the myocardium.​

• Aid the heart in the strength of contractions.​

Which of the following is the region of the thoracic cavity where the heart is located?

• Mediastinum

• Hypogastric

• Hypochondriac

• Pleural cavity

Which type of cell junction allows cardiac muscle tissue to transmit signals rapidly?​

• Adherens junction

• Gap junctions

• Neural synapses

• Tight junctions

• Hemidesmosomes

Which of the following elements is required to sustain a muscular contraction?

• Sodium

• Calcium

• Potassium

• ATP

• All of the above