This structure surrounds the early embryo and the fluid that fills it protects the embryo
A) amnion B) allantois C) chorion
Answer: A
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This subatomic particle is found in the nucleus of the atom.
a. electron b. neutron c. proton d. both B and C above
How does the blood—thymus barrier function to prevent premature stimulation of developing T cells?
What will be an ideal response?
Complement proteins, which are activated when IgG or IgM antibodies bind antigen,
A) cause lysis of the T cells. B) cause opsonization, which coats the antibody-antigen complexes in a way that attracts phagocytes. C) stimulate chemotaxis, in which neutrophils and macrophages are repelled from the affected area. D) stimulate cytokine release.
Answer the following questions true (T) or false (F)
1. An agonist is a muscle that provides most of the force required for a given movement. 2. A first-class lever has the fulcrum situated farther from the point of the applied force, with the load to be moved in between. 3. The medial rectus muscle and lateral rectus muscle pull the eye in the same direction.