29 Questions
Where is the heart located?
Mediastinum of thoracic cavity
Which side of the heart pumps blood through miles of blood vessels in the body systemically?
Left side
What is the function of the right side of the heart?
Pumps blood through the lungs to pick up oxygen
In which direction is the apex of the heart pointed?
Inferiorly to the left
Why is the heart described as a double pump?
It pumps blood through different sides for different functions
Which blood vessels branch from the ascending aorta to supply oxygen-rich blood to the myocardium of the heart?
Coronary arteries
What is the function of coronary capillaries in the heart?
Exchanging gases and nutrients/wastes
Where do coronary veins collect oxygen-poor blood in the heart?
Coronary sinus on the posterior of the heart
What connects cardiac muscle fibers end-to-end?
Intercalated discs
Which type of muscle fibers form the cardiac conduction system?
Autorhythmic fibers
What is the main function of contractile fibers in cardiac muscle tissue?
Propelling blood
Which chamber has thicker walls for pumping blood great distances throughout the body?
Left ventricle
What is the main function of atrioventricular valves in the heart?
Ensure one-way flow of blood
Why do atrial walls have thinner walls compared to ventricular walls?
To assist with gravity in delivering blood to ventricles
What causes heart valves to open and close?
Blood pressure differences across the valves
Where do semi-lunar valves in the heart lie?
Between ventricle and artery
What is the role of left ventricle in systemic circulation?
Pumping blood great distances to all parts of the body
What factor influences the forcefulness of contraction in the heart?
Contractility
Which of the following is NOT a factor that regulates and ensures equal pumping of blood by the right and left ventricles?
Blood pressure
In the context of heart function, what does the Frank-Starling law state?
Greater stretch during diastole results in greater force of contraction during systole
Which of the following hormones plays a role in regulating heart rate?
Thyroid hormones
Where is the origin of the nervous system regulation of heart rate?
Cardiovascular center in medulla oblongata
Which factor is responsible for the pressure that must be exceeded before the semilunar valves open and ventricular ejection begins?
Afterload
During which phase does ventricular relaxation occur?
Diastole
Which wave represents the onset of ventricular depolarization in a normal ECG?
QRS complex
What does the T wave in a normal ECG represent?
Ventricular repolarization
What occurs during atrial systole?
Ventricular systole begins
Which process masks atrial repolarization on an ECG?
QRS complex
In a normal ECG, what is the P wave associated with?
Atrial depolarization
This quiz discusses the variations in thickness among different heart chambers based on their functions. It covers topics such as the differences in wall thickness between atria and ventricles, as well as between left and right ventricles in relation to blood pumping mechanisms.
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