The Cardiovascular System: The Heart Chapter 19.1 Quiz

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Which layer of the heart is the most superficial?

Myocardium
Pericardium
Endocardium
Epicardium (correct)

Where is the heart located within the body?

Near the spleen
Between the kidneys
In the pericardial cavity (correct)
In the pulmonary cavity

Which chamber of the heart is responsible for pumping blood out to the body or lungs?

Left ventricle (correct)
Left atrium
Right ventricle
Right atrium

How many circuits are found in the heart?

2 (A) Signup and view all the answers

Which of the following structures attaches at the base of the heart?

Pulmonary trunk (D) Signup and view all the answers

What is the function of the auricles in the heart?

Collect blood and push it into lower chambers (A) Signup and view all the answers

What is the function of Ca++ channels at 0mV during repolarization?

Close (B) Signup and view all the answers

What is the purpose of the long refractory period in cardiac muscle?

To prevent premature contractions (A) Signup and view all the answers

Which component of the electrocardiogram represents the repolarization of the ventricles?

T wave (C) Signup and view all the answers

What is the role of troponin in muscle contraction?

It binds to Ca++ to allow myosin and actin cross-bridge formation (B) Signup and view all the answers

What is the main function of artificial pacemakers in the heart?

To deliver electrical impulses for effective heart contractions (A) Signup and view all the answers

What is the purpose of electrodes placed on the body during an electrocardiogram?

To record electrical signals of the heart (C) Signup and view all the answers

Which layer of the heart is continuous with the lining of the blood vessels?

Endocardium (B) Signup and view all the answers

Where does the Fossa ovalis exist?

In the interatrial septum (C) Signup and view all the answers

Which chamber of the heart has no pectinate muscles?

Left atrium (D) Signup and view all the answers

What ensures unidirectional blood flow in the heart?

Semilunar valves (A) Signup and view all the answers

What structure closes the tricuspid and mitral valves?

Papillary muscles (C) Signup and view all the answers

Which cells in the heart conduct impulses and contract to pump blood?

Myocardial conducting cells (C) Signup and view all the answers

What structure is known as the pacemaker of the heart?

SA node (C) Signup and view all the answers

Why do semilunar valves make an audible sound as they close?

Due to having no muscular attachments (A) Signup and view all the answers

What happens at +30mV in cardiac contractile cells?

Na+ channels close, Ca++ channels open, and few K+ channels open. (B) Signup and view all the answers

What is the function of desmosomes in cardiac muscle cells?

Stop the muscle cells from ripping apart. (B) Signup and view all the answers

What is the main function of myocardial contractile cells?

Conduct impulses and contract to pump blood. (C) Signup and view all the answers

Where do coronary arteries branch off from in the heart?

Aorta (B) Signup and view all the answers