Cardiovascular System Quiz: How Well You Know? Trivia

Atrial repolarization does not appear as a separate wave in the EKG because it is masked by the __________. Atrial repolarization takes place at the same time as ventricular excitation.

The T Wave of an EKG represents the electrical recovery of the __________. The muscle cells are recovering in preparation for another impulse.

In an EKG, what represents atrial depolarization?

• QRS Complex

• T Wave

• Baseline

• P Wave

• None of the above

Which part of the EKG represents ventricular depolarization?

• QRS Complex

• T Wave

• Baseline

• P Wave

• None of the Above

Which part of the EKG represents ventricular repolarization?

• QRS Complex

• T Wave

• Baseline

• P Wave

• None of the above

Body temperature can influence heart rate. If a person has a fever the heart rate is ______ by a rising body temperature. During hypothermia, however, lowering of the body temperature causes a _____ in the heart rate.

An _________ is a graphic representation (recording) of the cardiac cycle.

• Electrocardiogram

• EMG

• Electrocardiograph

• All of the above

• A and C only

 As the nerve impulses reach their endings they secrete the neurotransmitter _________ which causes a ________ in heart rate.

__________ carry impulses continuously. An increase in the parasympathetic impulses would result in a ________ heart rate. A decrease in the parasympathetic impulses would allow the heart rate to ________.

Both parasympathetic and sympathetic impulses originate in what part of the brain?

• Hypothalamus

• Cerebrum

• Medulla oblongata

• Cerebellum

• Hippocampus

________ originate in the ________ and travel to the heart by means of the _________ nerves and innervate both the S-A and A-V nodes. The endings of these fibers secrete the neurotransmitter ____________. The effect is an ________ in the heart rate and the force of the ____________.

Ion concentration influences heart action these ions are ______ and _______ ions. Ordinarily the concentration of these ions are kept within appropriate limits and do not affect the heart adversely. For example, hyperkalemia alters the usual _______ state and results in a _____ in the heart rate and force of contractions which may block the conduction of cardiac impulses and result in _________.

The P Wave on an EKG represents the transmission of an electrical impulse from the ________ throughout the _________ and occurs just before the atria contract

• A-V node, atrial myocardium

• S-A node, atrial myocardium

• S-A node, A-V node

• S-A node, heart

• S-A node, myocardium

Which part of an EKG represents the period when the entire heart returns to its resting or polarized state?

• QRS Complex

• T Wave

• Baseline

• P Wave

• None of the above

The S-A and A-V nodes are innervated by the _____________.

These electrical events occurring in the heart are powerful enough to be detected by placing electrodes on the body surface (skin) as _______ stimulate the cardiac muscle to contract.

• S-A nodes

• A-V nodes

• Sympathetic impulses

• Nerve tissue

• Action potentials

Which part of the EKG represents atrial repolarization?

• QRS Complex

• T Wave

• Baseline

• P Wave

• None of the above

An Electrocardiogram represents the electrical changes that occur in the _____ as it contracts and relaxes.

• Endocardium

• Left ventricle

• Right atrium

• Myocardium

• Heart

____________ make up parts of the vagus nerves and the fibers branch to both the S-A and A-V nodes.

• Sympathetic impulses

• Parasympathetic impulses

• Myofibrils

• Autonomic impulses

• Pressoreceptors

The cardiac control center of the _______ maintains a balance between the inhibitory effects of the ___________ fibers and the excitatory effects of the ________ fibers. Masses of neurons in this control center function as either a ______ reflex center or a _______ reflex center.

The reflex centers receive ______ impulses from various parts of the _________ and relay _____ impulses to the heart in response to ___________.

Pressoreceptors are located in the _____ and the _______, and function to detect changes in ____________.

When emotion affects the heart rate, the cardiac control center is being influenced by impulses from the ______ or the ________. These two centers of the brain may cause the heart rate to _______ when a person faints following an emotional upset or they may also cause the heart rate to ______ during a period of anxiety.

_______ is slower than _______, thus the T Wave is more spread out.

What other four factors can influence heart rate?

During strenous exercise the ________ require an increase in blood supply and the heart rate ____ to meet the demand.