Muscle myofibrils
A. contain myosin and actin myofilaments.
B. hold muscle fibers together.
C. are found in the sarcolemma.
D. do not appear striated.
E. extend from the sarcolemma to the T-tubule.
Answer: A
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A. Breathing air with increased PCO2 B. Higher than normal arterial pH C. Iron-deficiency anemia D. Lower than normal arterial PCO2 E. Breathing carbon monoxide
The action potential of a muscle fiber occurs
A. at the end plate. B. along the sarcolemma and down the T-tubules. C. within the sarcoplasmic reticulum. D. in the mitochondria.
When swallowing, the epiglottis covers the larynx
Indicate whether the statement is true or false
The process of cell death in which cell membranes remain intact but become bubbled and the nuclei condense is known as ________.
A. endocytosis B. apoptosis C. phagocytosis D. exocytosis