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Question
A small portion of testosterone secreted by the testes is converted to estrogen outside the testes by the enzyme __________.Answer
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Related questions
Q:
What type of cytotoxic T cells respond to foreign antigens only in association with class I MHC glycoproteins?
a. CD8+
b. CD7+
c. CD6+
d. CD5+
e. CD4+
Q:
What kind of helper T cells does HIV (the AIDS virus) selectively invade?
a. TH1
b. TH2
c. TFH
d. CD3+
e. CD4+
Q:
How many types of T cells are there?
a. two
b. three
c. four
d. five
e. six
Q:
Most antigens to which B cells respond are:
a. B-dependent antigens
b. T-dependent antigens
c. B antibodies
d. T antibodies
e. T cells
Q:
Innate lymphoid cells (ILCs) are innate mirror images of:
a. macrophages
b. natural killer cells
c. helper T cells
d. B cells
e. interferon
Q:
During the inflammation response, what components of the immune system are sent to the invaded or injured area?
a. eosinophils and basophils
b. monocytes and fatty acids
c. macrophages and eosinophils
d. neutrophils and monocytes
e. natural killer cells and plasma proteins
Q:
An increase in what type of leukocyte is associated with allergic reactions?
a. neutrophils
b. basophils
c. monocytes
d. eosinophils
e. lymphocytes
Q:
How many types of circulating leukocytes are there?
a. 3
b. 4
c. 5
d. 6
e. 7
Q:
What makes hemoglobin red colored when combined with oxygen?
a. oxygen
b. plasma protein
c. sodium
d. chloride
e. iron
Q:
What are erythrocytes?
a. plasma proteins
b. cell fragments
c. white blood cells
d. red blood cells
e. immune cells
Q:
Summarize the role of the immune system.
Q:
Which number in the figure representsactivated platelets releasing ADP and thromboxane A2?a. 1b. 2c. 3d. 4e. 5
Q:
Which number in the figure represents newly activated platelets aggregating onto the growing platelet plug?a. 1b. 2c. 3d. 4e. 5
Q:
Thrombin exists in the __________ in the form of an inactive precursor called __________.
Q:
Formation of a platelet plug involves the three successive, closely integrated events of adhesion, __________, and aggregation.
Q:
Because platelets are cell fragments, they lack __________.
Q:
Granulocytes and monocytes are produced only in __________.
Q:
The protein that enables RBCs to transport O2 is __________.
Q:
Vitamin B12 deficiency can cause a bleeding tendency because of incomplete activation of vitamin B"dependent clotting factors.
a. True
b. False
Q:
All leukocytes ultimately originate from common precursor undifferentiated pluripotent stem cells in the spleen.
a. True
b. False
Q:
Hemoglobin is found only in leukocytes.
a. True
b. False
Q:
What enzyme dissolves the clot as part of the healing process?
a. thrombin
b. fibrin
c. fibrinogen
d. plasmin
e. plasminogen
Q:
How many steps are involved in the intrinsic pathway to the clotting cascade?
a. four
b. five
c. six
d. seven
e. eight
Q:
What is fibrin's most important property?
a. stretchiness
b. hardness
c. sponginess
d. softness
e. porosity
Q:
How long do platelets remain functional for?
a. 10 days
b. 7 days
c. 5 days
d. 2 days
e. 10 hours
Q:
A cancerous condition involving uncontrolled proliferation of WBCs is known as:
a. neutrophilia
b. lymphoma
c. sickle cell anemia
d. malaria
e. leukemia
Q:
Describe short-term and long-term control measures of blood pressure.
Q:
Describe the effect of sympathetic activity on venous return.
Q:
Explain the meaning of flow in terms of the bloodstream.
Q:
Which number in the figure represents the pressures experienced by the arteries?a. 1b. 2c. 3d. 4e. 5