Parkinson's disease is
a. associated with an excess of dopamine
b. characterized by an intention tremor
c. characterized by a resting tremor
d. characterized by all of the above
e. associated with abnormalities in the limbic system
C
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Which of the following best describes the term sarcoplasmic reticulum?
A) protein that accounts for elasticity of resting muscle B) repeating unit of striated myofibrils C) storage and release site for calcium ions D) thin filaments are anchored here E) largely made of myosin molecules
The cervical and lumbosacral enlargements are wide points in the spinal cord marking the emergence of motor nerves.
Answer the following statement true (T) or false (F)
During what phase of the action potential will calcium ions enter the contractile cell as potassium ions exit?
A) repolarization phase B) initial repolarization phase C) plateau phase D) rapid depolarization phase
Match the chemical signal with the appropriate description.A. Chemicals produced by neurons that function as hormonesB. Chemicals that act locally on nearby cellsC. Chemical secreted by presynaptic terminalD. Influences same cell type from which it is secretedE. Chemical secreted into blood by specialized cells; travels some distance to target tissuesEndocrine
Fill in the blank(s) with the appropriate word(s).