Answer the following questions true (T) or false (F)
1. Gastrin increases hydrogen ion secretion by the stomach.
2. Secretin, gastric-inhibitory peptide (GIP), somatostatin, and the enterogastric reflex increase acid secretion by the stomach.
3. Julie smelled cake baking in the oven, triggering the gastric phase of stomach regulation.
1. TRUE
2. FALSE
3. FALSE
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Transverse tubules
A) transmit muscle impulses into the cell interior. B) connect actin and myosin. C) store sodium ions for the action potential at the cell surface. D) store calcium ions.
Lipids are used for which of the following?
A) to form essential structural components of cells B) to provide roughly 10 times as much energy as carbohydrates C) to help reduce body temperature D) to help protect the skeleton E) to carry genetic information
In the human body, most of the lever systems formed by muscles pulling on bones are what class?
A. 1st class B. 2nd class C. 3rd class D. no particular class is dominant
An action potential does not re-stimulate the adjacent membrane that was previously depolarized because
A. stimulation is inhibited by the myelin sheath. B. it is impossible for an action potential to be propagated along an axon toward the nerve cell body. C. the resting membrane potential of the axon is too positive. D. the resting membrane potential of the axon is too negative. E. that area of the membrane is in the absolutely refractory period.