Which of the following indicates that the immune system has achieved versatility?

A) Millions of NK cells are produced to ensure efficient immune surveillance.
B) Lymphocytes, which are sensitive to an antigen, undergo repeated cell divisions.
C) Production of many normal B cells and T cells, which will attack "self" antigens, occurs.
D) Lymphocyte cell divisions produce two cell types: one group, which will attack specific antigens, and another group, which will remain inactive until exposed to the same antigen later.
E) Millions of different lymphocyte populations are produced, each with different antigen receptors.


E) Millions of different lymphocyte populations are produced, each with different antigen receptors.

Anatomy & Physiology

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Name the paired central nervous system nuclei that adjust the pace of respiration

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Postganglionic sympathetic fibers to the abdomen originate from:

a. dorsal root ganglia b. collateral ganglia c. cranial ganglia d. chain ganglia

Anatomy & Physiology

This figure shows the muscles of facial expression. What muscle does number 3 indicate?

A. Platysma B. Epicranius C. Orbicularis oris D. Orbicularis oculi E. Nasalis

Anatomy & Physiology

NaCl is a molecule formed by the covalent bonding of a sodium atom to a chlorine atom.

Answer the following statement true (T) or false (F)

Anatomy & Physiology