The ________ helps hold a tooth in its socket.
A. periodontal ligament
B. crown
C. pulp cavity
D. alveoli
E. dental arch
Answer: A
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Which of the following is involved in the relaxation of a muscle cell?
a. Synthesis of ACh by acetylcholinesterase b. Initiation of action potentials c. The troponin-tropomyosin complex slipping back into its blocking position d. Detachment of actin from tropomyosin e. T tubules actively absorbing Ca2+
The factor responsible for differentiating the embryonic gonads into testes is
a. the sex-determining region of the X chromosome. b. the sex-determining region of the Y chromosome. c. autosomal chromosomes. d. male gonadal-determining factor. e. the Sertoli cells.
Which of the following statements is not true of reverberating circuits?
A. The effect of reverberating circuits is longer lasting due to the continuous generation of action potentials. B. The number of action potentials in the circuit are increased due to the positive feedback of neurons synapsing with other neurons that occur earlier in the circuit. C. The number of action potentials decreases the farther along the circuit due to inhibitor effects of collateral axons. D. All of the choices are correct.
A hydrogen acceptor in a solution is called a:
What will be an ideal response?