Positive inotropic drugs such as glucagon and thyroid hormone cause
A) decreased heart rate.
B) increased heart rate.
C) increased contractility.
D) decreased contractility.
E) asystole.
C
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As someone starts to develop in puberty, most cells in their reproductive organs are probably starting to express
A. more receptors for sex hormones. B. fewer receptors for sex hormones.
This type of connective tissue is primarily composed of cells
A) adipose B) bone C) blood D) hyaline cartilage
Matching
A) Humerus B) Radius C) Phalanges 20) The fingers have three of these bones and the thumb has only two. 21) This bone articulates with the glenoid fossa. 22) Forearm bone that articulates with most of the carpals.
What is the importance of the delay in the action potential in the AV node?
A. It allows the action potential to reach both ventricles at the same time. B. It allows an action potential to reach the left atrium so both atria contract together, before the ventricles contract. C. It allows time for the atria to fill with blood. D. It allows an action potential to reach the left atrium so both atria contract together.