Which of the following best describes a simple nervous system

A. the flow of information is only one direction: toward an integrating center.
B. the flow of information is only one direction: away from an integrating center.
C. a system that includes sensory information, an integrating center, and effectors.

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.