Excitation-contraction coupling begins with
A. the depolarization at the T tubules.
B. the release of the cross-bridge.
C. the release of Ca2+ from the sarcoplasmic reticulum.
D. the production of an action potential in the sarcolemma.
Answer: D
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Answer the following statements true (T) or false (F)
1. The last two sets of ribs that are only attached to the vertebrae are called false ribs. 2. The sternum is also called the breastbone. 3. The scapula and clavicle make up the pectoral girdle. 4. The tibia and fibula are the bones of the lower arm. 5. The femur is the bone of the thigh.
The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "D"?
A. major site of ATP synthesis when oxygen is available B. contains digestive enzymes C. outer boundary of cell, controls entry and exit of substances D. directs cellular activities, contains DNA E. site of protein synthesis
The indicators that are essential for human life include all of the following EXCEPT ________.
A. coloring B. heart rate C. respirations D. temperature
If the gray matter of the spinal cord were to begin degenerating, which of the following structures would be breaking down?
A. Interneurons B. Myelin C. Cerebrospinal fluid D. Axons