The structure in the thymus that prevents foreign substances from entering the thymus is the a. thymic corpuscle barrier
b. blood-thymic barrier
c. surface membrane barrier
d. capsular barrier
e. thymic filter
Adaptive immunity is stimulated by
a. Antigensb. Histaminesc. Antibodies
d. Complement
e. plasma proteins
When the blood pressure of a vessel drops below the critical closing pressure for that vessel,
a. there is hypertensionb. there is an increase in blood flowc. there is an increase in peripheral resistance
d. the vessel collapses
e. the vessel expands
The lymphatic system differs from the cardiovascular system in that
a. the lymphatic system only carries fluid away from tissuesb. the lymphatic vessels have their own “pump” to assist flowc. lymph capillaries do not contain any fluid
d. lymph capillaries allow free movement of fluid in and out of the capillaries
e. lymph circulates fluids and cardiovascular does not
Veins
a. carry blood away from the heartb. carry blood under very high pressurec. may contain valves and are lined with endothelium
d. are described as strong, rigid vessels that always carry oxygenated blood
e. have thick, many layered walls
Veins that return blood directly to the heart include the
a. brachiocephalic veinb. superior vena cavac. portal vein
d. azygos vein
e. pulmonary arteries
Identify structure “A” on the heart diagram.
a. left atrium
b. aortic semilunar valve
c. bicuspid (mitral) valve
d. right atrium
e. pulmonary semilunar valve
Systemic blood vessels transport blood
a. from the left ventricle through the body to the left atriumb. from the left ventricle through the body to the right atriumc. from the right ventricle through the body to the left atrium
d. from the right ventricle through the body to the right atrium
e. from the left ventricle to the lungs
U.S Elite Tutors is a leading academic writing company, which has been providing exclusive writing services for years. We are here to help you write any paper on our new website 24/7.
For any questions, feedback, or comments, we have an ethical customer support team that is always waiting on the line for your inquiries.