Which of the following structures is NOT produced from the mesoderm?
a) Melanocytes
b) All skeletal muscle
c) All cardiac muscle
d) Blood vessels
e) Lymphatic tissue
A
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Put the following events of excitation-contraction coupling in the order in which they occur. 1. Excitation 2. Sarcomere shortening 3. Generation of muscle tension 4. Neural control 5. Contraction cycle begins 6. Release of calcium ions
A) 4,1,5,2,6,3 B) 4,1,6,5,2,3 C) 1,2,5,6,3,4 D) 6,1,4,2,5,3 E) 1,4,6,2,5,3
Astrocytes
a. induce formation of the blood-brain barrier b. are important in the repair of brain injuries and in neural scar formation c. take up excess K+ from the brain ECF d. physically support neurons e. perform all of the above functions
Which of the following is NOT an explanation for how one gene can produce more than one protein?
A. Posttranslational methylation and phosphorylation B. Different carbohydrates bonded to the protein C. Various cuts and splices of mRNA D. Different groups of polypeptides associating to make different proteins
What are the three types of interactive effects hormones can have?
a) synergistic b) permissive c) antigenic d) antagonistic e) linear