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
