Myocardial Thickness and Function

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Where is the heart located?

Cranial cavity

Pelvic cavity

Abdominal cavity

Mediastinum of thoracic cavity (correct)

Which side of the heart pumps blood through miles of blood vessels in the body systemically?

Left side (correct)

Both sides equally

Neither side

Right side

What is the function of the right side of the heart?

Pumps blood to the brain

Pumps blood through the body systemically

Pumps blood to the digestive system

Pumps blood through the lungs to pick up oxygen (correct)

In which direction is the apex of the heart pointed?

Inferiorly to the left Signup and view all the answers

Why is the heart described as a double pump?

It pumps blood through different sides for different functions Signup and view all the answers

Which blood vessels branch from the ascending aorta to supply oxygen-rich blood to the myocardium of the heart?

Coronary arteries Signup and view all the answers

What is the function of coronary capillaries in the heart?

Exchanging gases and nutrients/wastes Signup and view all the answers

Where do coronary veins collect oxygen-poor blood in the heart?

Coronary sinus on the posterior of the heart Signup and view all the answers

What connects cardiac muscle fibers end-to-end?

Intercalated discs Signup and view all the answers

Which type of muscle fibers form the cardiac conduction system?

Autorhythmic fibers Signup and view all the answers

What is the main function of contractile fibers in cardiac muscle tissue?

Propelling blood Signup and view all the answers

Which chamber has thicker walls for pumping blood great distances throughout the body?

Left ventricle Signup and view all the answers

What is the main function of atrioventricular valves in the heart?

Ensure one-way flow of blood Signup and view all the answers

Why do atrial walls have thinner walls compared to ventricular walls?

To assist with gravity in delivering blood to ventricles Signup and view all the answers

What causes heart valves to open and close?

Blood pressure differences across the valves Signup and view all the answers

Where do semi-lunar valves in the heart lie?

Between ventricle and artery Signup and view all the answers

What is the role of left ventricle in systemic circulation?

Pumping blood great distances to all parts of the body Signup and view all the answers

What factor influences the forcefulness of contraction in the heart?

Contractility Signup and view all the answers

Which of the following is NOT a factor that regulates and ensures equal pumping of blood by the right and left ventricles?

Blood pressure Signup and view all the answers

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 Signup and view all the answers

Which of the following hormones plays a role in regulating heart rate?

Thyroid hormones Signup and view all the answers

Where is the origin of the nervous system regulation of heart rate?

Cardiovascular center in medulla oblongata Signup and view all the answers

Which factor is responsible for the pressure that must be exceeded before the semilunar valves open and ventricular ejection begins?

Afterload Signup and view all the answers

During which phase does ventricular relaxation occur?

Diastole Signup and view all the answers

Which wave represents the onset of ventricular depolarization in a normal ECG?

QRS complex Signup and view all the answers

What does the T wave in a normal ECG represent?

Ventricular repolarization Signup and view all the answers

What occurs during atrial systole?

Ventricular systole begins Signup and view all the answers

Which process masks atrial repolarization on an ECG?