The plateau of the cardiac action potential results from the opening of voltage-gated slow ____ channels in the plasma membrane of the ____ cell
a. sodium; contractile
b. potassium; autorhythmic
c. calcium; contractile
d. chloride; pacemaker
e. potassium; contractile
C
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Which of the following is part of the fibrous tunic of the eye?
A. The rods B. The choroid C. The sclera D. The retina E. The vitreous body
Match the form of RNA with its function:
1. rRNA 2. mRNAs 3. tRNA 4. microRNA A. Carries genetic instructions from the nucleus to the site of protein synthesis B. Uses an anticodon to guide its attached amino acid to the complementary codon on the mRNA at the ribosome C. Combines in a complex with proteins to make the large and small subunits of a ribosome D. Can suppress and silence certain mRNAs
The time required for the ventricles to contract is represented by the ________ of the ECG.
A. P-Q segment B. P wave C. T wave D. QRS complex E. S-T segment
The anatomic changes that result from disease are studied under
A. surgical anatomy. B. developmental anatomy. C. histology. D. systemic anatomy. E. pathologic anatomy.