Diagram the basic steps of a stretch reflex arc
What will be an ideal response?
First, a sensory neuron carries messages from receptors to the CNS. Then, a motor neuron carries messages from the CNS to the effectors. Finally, effectors (a muscle or gland) responds to nerve signals by producing movement or chemicals.
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Copper is essential for producing melanin and myelin
Indicate whether the statement is true or false
Identify the correct statement(s)
a. The DRG consists of both inspiratory neurons and expiratory neurons. b. The neurons of the DRG remain inactive during normal quiet breathing. c. The DRG is called into play by the VRG as when demands for ventilation are increased. d. All of the above are correct. e. None of the above are correct.
Identify the three basic components of connective tissue
A) connective tissue cells, basement membrane, and hemidesmosomes B) neuroglial cells, axon and dendrite framework, and electrical conduction pathway C) specialized cells, protein fibers, and ground substance D) ducts, pores, and secretory areas E) contractile units, vascular beds, and calcium storage
Which of the following is NOT a chemical barrier that helps prevent entry of microbes into the body tissues?
A. Sebum B. Normal flora C. Lysozyme D. Cytokines