Exam 20: The Cardiovascular System: The Heart

In comparison to skeletal muscle fibers,the contractile fibers of the heart are depolarized for ____ period of time.

During which of following periods does the largest volume of blood enter the arteries?

The second heart sound (dupp)closely follows which of the events listed below?

This is comprised of a thin layer of endothelium overlying a thin layer of connective tissue.

The difference between a person's maximum cardiac output and resting cardiac output is called the

In the diagram,which labeled structure prevents blood flow from the right ventricle back into the right atrium?

Which of the following correctly lists the sequence of structures that a cardiac action potential follows in order to excite normal contraction of the heart?

The membrane that surrounds and protects the heart is called the

Cardiac output is the volume of blood ejected from the ______ ventricle into the _____ each minute.

What of the following chambers of the heart contain deoxygenated blood?

In a fetus,this structure allows blood to flow directly from the pulmonary trunk into the aorta.

In comparison to a sedentary individual,a well-trained athlete will usually have all the following characteristics EXCEPT

What labeled structure in the figure is the ligamentum arteriosum?

Which structure in the figure is labeled B?

This structure in the heart initiates action potentials that stimulate contraction of the heart at constant rate of about 100 beats per minute.

This pouch-like structure increases the total filling capacity of the atrium.

Discuss the common nutrient sources used by cardiac muscle to produce ATP in a resting individual.

In the diagram,which labeled structure is the pulmonary semilunar valve?

In the diagram,where is the left auricle of the left atrium?

Which of the following chambers of the heart is surrounded by the thickest layer of myocardium?