What is the pigment that protects deeper cells of the skin from harmful UV radiation?
A) melanocytes
B) keratin
C) keratinocytes
D) melanin
D
Explanation:
A) Melanocytes produce melanin.
B) Keratin protects the skin from dehydration and friction.
C) Keratinocytes are cells that produce keratin.
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Diagnosing a disease involves determining the
A. cause of the homeostatic imbalance.?B. multiple side effects of a drug.?C. effector and the set point.?D. negativity of the feedback.
Muscle tension
a. is created during muscle contraction as the tension generated by the contractile elements is transmitted via the connective tissue and tendons to the bones. b. is the force exerted on a muscle by the weight of an object. c. is greater than the load during an isometric contraction. d. more than one of these. e. none of these answers.
Which of the four hormonal effects are involved in a negative feedback response?
A) antagonistic effects B) additive effects C) permissive effects D) integrative effects
________ tissue exhibits the characteristics of excitability, contractility, and elasticity
A) Connective B) Nervous C) Muscle D) Epithelial