More myoglobin is typically found in type 2X skeletal muscle fibers.
Answer the following statement true (T) or false (F)
False
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Which vessel of the heart receives blood during right ventricular systole?
A) venae cavae B) pulmonary trunk C) aorta D) pulmonary veins
Conduction by local current flow
a. occurs in unmyelinated fibers. b. is faster than propagation of an action potential in myelinated fibers because myelin acts as an insulator to slow down the impulse. c. involves current flowing locally between the active and adjacent inactive areas, thereby bringing the inactive areas to threshold so that they too become active (i.e., have an action potential). d. both (a) and (c) above. e. all of these answers.
An Olympic sprinter readies for a race. After the sound of the starting gun, he propels himself forward from the starting block and immediately grimaces in pain, grabbing for the back of his thigh. Within 48 hours he begins noticing extensive bruising on the back of his thigh extending into the back of the knee. He now has difficulty rising from a seated position and flexing his knee. Bending at the waist generates more pain. Which muscle is likely injured?
A. Biceps femoris B. Iliopsoas C. Gastrocnemius D. Gluteus maximus E. Popliteus
Which of the following tissues is avascular and composed of tightly packed cells with little extracellular material?
A. Epithelial tissue B. Hyaline cartilage C. Osseous tissue D. Skeletal muscle tissue E. Nervous tissue