- Active sites on the actin become available for binding after ________.
- The ________ nervous system controls the skeletal muscles.
- Skeletal muscle fibers are formed from embryonic cells called ________.
- Triceps brachii insert on the olecranon process of the ulna and can act to ________.
- The following are the main steps in the generation of an action potential. 1. Sodium channels are inactivated. 2. Voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization. 3. Sodium channels regain their normal properties. 4. A graded depolarization brings an area of an excitable membrane to threshold. 5. A temporary hyperpolarization occurs. 6. Sodium channel activation occurs. 7. Sodium ions enter the cell and depolarization occurs. The proper sequence of these events is:
- The most abundant class of neuron in the central nervous system is ________.
- Which of the following are a type of glial cell found in the peripheral nervous system?
- The ability of smooth muscle to function over a wide range of lengths is called ________.
- Receptors for acetylcholine are located on the ________.
- The most common lever systems in the body are those that have the applied force between the fulcrum and the load. These are called ________ levers.
- Interactions between actin and myosin filaments of the sarcomere are responsible for ________.
- The area in the center of the A band that contains no thin filaments is the ________.
- The type of muscle fiber that is most resistant to fatigue is the ________ fiber.
- The percentage of red blood cells in a sample of human blood is normally about
- The most active phagocytic cells among that leukocytes are
- Which of the following elements is included in hemoglobin molecules
- The biconcave cells in blood that lack nuclei when they are mature are the
- The tissue that forms a loose fitting sac around the heart is the
- Which of the following is secreted by neurosecretory cells in the posterior lobe of the pituitary gland
- Which of the filling hormones exerts in effect primarily on the reproductive organ