Bio 224A Cardio Flashcards
the pulmonary circuit involves blood flow form the heart to and from the
Lungs
What is the function of the valves in the heart
Prevent backflow of blood through the heart
Which vessel is guarded by a semilunar valve at its base
Pulmonary trunk
What vessels deliver oxygenated blood to the left atrium
Pulmonary veins
During what part of the action potential will calcium ions enter the contractile cell
Plateau phase
What normally serves as the pacemaker of the entire heart
Sinoatrial (SA) node
The P-wave on a ECG represent the depolarization of the cells in the
Artia
Which of the following can be used to measure heart rate?
R-R interval
The amount of blood remaining in each ventricle at the end of the ventricular ejection phase is normally about
50 ml
What two values are needed in order to calculate cradiac output for ventricle
Stroke volume and heart rate
The degree of stretch experienced by the sarcomeres in the ventricles cells before they contract is called
preload
Which of the following decreases heart rate
acetylcholine
Blood in the right atrium should travel next past the
Tricuspid valve and into the right ventricle
A damaged Av bundle or Av node will primarily affect the length of the
P-R interval
Calculate the end-systolic volume if the end diastolic volume in a resting heart is 110 ml and stroke volume is 70 ml
40 ml
Which of the following arteries has the smallest diameter?
Metarteriole
Which of the following connects vessels through vascular anastomoses?
Collaterals
Which blood vessels handle the highest BP?
Systemic arteries
What two values are needed to calculate mean arterial pressure ( MAP)?
Diastolic pressure and systolic pressure
Which of the following stimuli is detected by a chemoreceptor?
Decreased blood oxygen concentration
What hormone is released to decrease bp?
Atrial natriuretic peptide ( ANP)
By which method can large substances cross the endothelial cells and exit a capillary?
Transcytosis
Which capillary would be leat likely to allow substances to enter or exit the blood due to tight junctaions that join the endothelial cells
Continuous capillaries