Which of these orders of muscle structures progresses from the smallest to largest in diameter?
A) muscle, fascicle, muscle fiber, myofibril
B) fascicle, myofibril, muscle fiber, filament
C) muscle, muscle fiber, myofibril, fascicle
D) myofibril, muscle fiber, fascicle, muscle
E) fascicle, muscle fiber, myofibril, muscle
D) myofibril, muscle fiber, fascicle, muscle
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Some proteins, like hemoglobin or antibody molecules, require multiple polypeptide chains to come together to act as a single protein. If the association among the different polypeptide chains is blocked, the ________ structure of the protein is destroyed.
A) primary B) secondary C) tertiary D) quaternary E) binary
Which of the following best describes the Vasalva maneuver?
A. It is used to dislodge foreign matter from the airway. B. It prevents food and drink from entering the nasal cavity. C. It prevents food and drink from entering the trachea. D. It protects the lungs from overinflation. E. It increases pressure in the abdominal cavity and helps to expel abdominal contents.
Which antineoplastic drug inhibits folic acid synthesis?
a. methotrexate b. 5-fluorouracil c. cytarabine d. vincristine
Modifiers that affect heart rate are _______.
A) agonists B) antagonists C) inotropic D) chronotropic