In the digestive system, autonomous smooth muscle activity
a. involves slow-wave potentials.
b. involves a basic electrical rhythm initiated by pacesetter cells.
c. is initiated by the interstitial cells of Cajal.
d. is initiated by cells in the boundary between circular and longitudinal muscle.
e. all of these.
E
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About 23% of the carbon dioxide in the blood is attached to the _______ portion of hemoglobin
A. heme B. globin C. carboxyl D. anhydrase
Answer the following statements true (T) or false (F)
1. In order for the necessary bridges to form, potassium must be released from the endoplasmic reticulum. 2. In the sliding filament model of muscle contraction, bridges are formed between the myosin and actin. 3. Energy for muscle contraction is provided when ATP is broken down. 4. In order for movement to take place, when the prime mover contracts, the synergist must relax. 5. In order for movement to take place, the antagonists must do the opposite of the prime mover.
What structure separates the right ventricle from the left ventricle?
A. Anterior interventricular sulcus B. Interventricular septum C. Interatrial sulcus D. Coronary sulcus
Which of the following is a cause of asthma?
A. Environmental chemicals that stimulate ?2-adrenergic receptors B. Elevation of intrapleural pressure to equal atmospheric pressure C. Loss of alveoli D. Lack of pulmonary surfactant E. Inflammation of the bronchioles