The hormone gastrin controls muscle contraction and secretion by the stomach.
Answer the following statement true (T) or false (F)
True
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What is the pacemaker that sets the rate of the heartbeat?
A. The AV node B. The Purkinje fibers C. The vagus nerve D. The SA node E. The bundle of His
The ____________________ system controls and coordinates bodily activities that require swift responses, especially to changes in the external environment
Fill in the blank(s) with correct word
Hemoglobin
a. combines preferentially with O2 over any other substance. b. when combined with carbon dioxide is known as carboxyhemoglobin. c. plays a critical role in determining the amount of O2 that is exchanged between alveoli and blood, because it acts as a storage depot, removing dissolved O2 from the blood thereby keeping PO2 low and allowing net diffusion of O2 to continue until the hemoglobin is completely saturated. d. both (a) and (b) above. e. all of these answers
This figure shows an anterior view of the spinal cord and meninges. What structure does number 1 indicate?
A. Posterior root B. Posterior root ganglion C. Anterior root ganglion D. Anterior root E. Gray commissure