Anatomy Quiz Ch. 21- 23

Which of the following occurs during ventricular systole?

-Ventricular pressure exceeds arterial pressure. -The atrioventricular valves close. -The semilunar valves open. -Atrial diastole occurs. ***All of the listed responses are correct.***

In the spleen, the cell population of the red pulp includes __________.

All of the listed responses are true.

Which of the following statements regarding blood vessel distribution is FALSE?

Arteries and veins rarely make anastomotic connections that reduce the impact of temporary or permanent vessel occlusion.

Where does the systemic circuit begin and end?

It begins at the aortic valve and ends at the entrance to the right atrium.

Which of the following statements regarding the spleen is INCORRECT?

It lies along the curving lateral border of the stomach, extending between ribs 8 and 10 on the left side.

Which of the following statements INCORRECTLY describes cardiac muscle tissue/cells?

The T tubules of cardiac muscle cells are relatively short, and they form triads with the sarcoplasmic reticulum.

Which of the following statements about the myocardium is FALSE?

The myocardium is continuous with the endothelium of the attached blood vessels.

Which of the following is NOT an accurate description of lymphatic vessels?

The valves prevent the backflow of lymph within lymphatic capillaries.

Which of the following most accurately describes the left ventricle?

There are two large papillary muscles, rather than three, in the left ventricle.

Which of the following does NOT offer a way to distinguish arteries from veins in histological sections?

When not opposed by blood pressure, venous walls contract.

Which branch(es) of the left coronary artery (LCA) is/are continuous with small branches of the posterior interventricular branch of the right coronary artery (RCA), thereby forming anastomoses?

anterior interventricular branch

Direct connections between arterioles and venules are known as

arteriovenous anastomoses

Which of the following features of lymphatic capillaries have the important function of helping to keep the passageways open when interstitial pressures increase?

collagenous anchoring filaments

Which of the following options is TRUE regarding the Thymus gland?

contains stem cells that produce daughter cells that mature into T cells

Which of the following features is/are NOT associated with the right atrium?

conus arteriosus

The superior end of the right ventricle tapers to a smooth-walled, cone-shaped pouch called the _______________, which ends at the _______________.

conus arteriosus; pulmonary valve

How many pulmonary veins typically exist in the human?

four

Typical lymphoid nodules often have a pale central zone, called a __________, which contains activated, dividing __________.

germinal center; lymphocytes

The lymphoid system does NOT __________.

maintain a higher blood volume

Venules smaller than 50 µm in total diameter lack which of the following layers?

media only

The blood pressure in venules and __________ is too low to oppose the force of gravity; therefore, one-way valves are formed by infoldings of the __________ layer.

medium-sized veins; intima

If serious hemorrhaging occurs, the vasomotor center of the __________ stimulates sympathetic nerves innervating smooth muscle cells in the walls of __________, resulting in venoconstriction.

medulla oblongata; medium-sized veins

Which cardiac vein(s) drain(s) the area supplied by the posterior interventricular artery?

middle cardiac vein

In humoral immunity, helper T cells promote the differentiation of __________ and accelerate the production of __________.

plasmocytes; antibodies

All of the following structures are typically branches of the aortic arch EXCEPT __________.

right common carotid artery

A large percentage of the sternocostal surface of the heart is composed of the _______________.

right ventricle

Which region of the lymph node contains a meshwork of branching reticular fibers, macrophages, and dendritic cells?

subcapsular space

Which population(s) of lymphocytes assists(s) in the regulation and coordination of the immune response?

suppressor T cells

In the adult, remnants of the ductus arteriosus persist as which of the following structures?

the ligamentum arteriosum

Which of the following consists of loose connective tissue that is bound to the cardiac muscle tissue of the heart?

visceral pericardium