A&p

The delay at the AV node supports coordinated blood flow through the heart by______

Allowing the atria time to push blood into the ventricles right before the ventricles contract

Heart rate; stroke volume

And individual's number of heartbeats per minute is known as his_____, While the volume of blood that is pumped by his ventricles with each heartbeat is his______

How do you differentiate between electrical activity in atria & ventricles on an ECG?

Atrial activity is seen in the P-wave while ventricular activity is seen in the QRS complex

How does your body respond when you need more blood, e.g. during a period of intense exercise?

By increasing your cardiac output

How is cardiac output calculated?

By multiplying the heart rate by the stroke volume

When is the human heart under the lowest pressure?

During diastole

Which of the following explanations describe the cardiac cycle of the human heart?

Events that happen during a single heartbeat

What happens if an individual's heart rate increases, but he stroke volume remains the same?

His ventricles pump with more force

At the beginning of the pulmonary circuit

If a sample of blood is deoxygenated where is it likely to be found in the circulatory system of the body

SA node, AV node, bundle of his, bundle branches, Purkinje fibers

In what order are the impulses transmitted in the intrinsic conduction system?

The SA node is called the pacemaker of the heart because it ______

Initiates the heartbeat through cells that can depolarize on their own

Which of the following statements is false concerning the Intrinsic conduction system?

It Creates the impulses that cause the heartbeat speed up in response to stress

How can fibrillation be fatal?

It can cause the hard to become a useless pump?

The Pulmonary circuit

The circulation of blood from the right side of the human heart to the lungs and back to the heart completes which circuit?

Which events or not happening during diastole of the human heart?

The semilunar valves are open

What might happen if the Purkinje fibers were damaged or not operating correctly?

The ventricles may not fully receive the electrical impulse that causes them to contract

Which of the following statements describes the end diastolic volume

The volume of blood in the ventricles after the atria contract

What is the job of the human body's pulmonary circuit

To carry blood to the lungs so carbon dioxide can be released and oxygen can be picked up

What is the purpose of the systemic circuit of the human body?

To supply blood rich in oxygen and nutrients to the body

165 liters / minute

Trent's heart beats 80 times per minute, and each time is his heart pumps it pushes out 85 mL of blood on average. what is his current cardiac output?

Heart block

What condition could result if there is damage to the AV node

Bradycardia

What is the heart rate slower than 60 bpm called?

During systole

When is blood forced into the aorta of human heart?

Scar tissue at the AV node

Which of the following is likely to cause an increased P-Q or P-interval

The Lungs

Which part of the human body is NOT considered a part of the circulatory system