Which of the following is a difference between primary and secondary active transport?
A)Energy is required for primary active transport, but energy is not required for secondary active transport.
B)Primary active transport is driven by secondary active transport.
C)In primary active transport, the transport protein gets phosphorylated; in secondary active transport, the transport protein is not phosphorylated.
D)Primary active transport is used to transport sugars and amino acids across the plasma membrane, while secondary active transport includes the sodium-potassium pump.
C)In primary active transport, the transport protein gets phosphorylated; in secondary active transport, the transport protein is not phosphorylated.
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A patient with Bell's palsy (facial nerve paralysis) has difficulty chewing because food gets stuck in his vestibule on the paralyzed side. This is mainly due to paralysis of which muscle?
A. Masseter B. Levator anguli oris C. Buccinator C. Superior pharyngeal constrictor D. Medial pterygoid
The ability of some cardiac muscle cells to initiate their own depolarization and cause depolarization of the rest of the heart is called
a. absolute refractory period. b. fibrillation. c. a functional syncytium. d. an action potential. e. automaticity.
Which feature permits the compression necessary to pump large volumes of blood out of the ventricles?
A. Absence of oxygenated blood in the atria B. Presence of papillary muscles in the ventricles C. Arrangement of cardiac muscle in the heart wall D. Negative pressure inside the ventricles E. Presence of skeletal muscle tissue in the heart skeleton
Deep grooves within the cerebral hemispheres are known as gyri.
a. true b. false