Explain the five functions of the skeletal system
What will be an ideal response?
1. Support—the skeletal system forms the body's internal structural framework. The bones of the legs act as pillars to support the body trunk when we stand, and the rib cage supports the thoracic wall.
2. Movement—the skeletal muscles, attached to bones by tendons, use the bones as levers to move the body and its parts.
3. Protection—bones, such as the skull, thorax, and pelvis, protect the enclosed soft body organs.
4. Storage—fat is stored in the internal cavities of bones. Bones also serve as a storehouse for minerals, the most important being calcium and phosphorus.
5. Blood cell formation—hematopoiesis occurs within the red marrow of certain bones.
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The juxtaglomerular apparatus
a. secretes renin in response to sodium depletion or plasma volume reduction. b. is a thickened region of specialized cells at a point where the distal tubule comes into intimate contact with the afferent and efferent arterioles of the same nephron. c. is where reabsorption of sodium occurs. d. both (a) and (b) above. e. all of these answers.
In the sarcomere which elastic protein attaches the thick filament to the Z line?
What will be an ideal response?
Most corticospinal tracts decussate in the ________.
A. midbrain B. spinal cord C. medulla oblongata D. basal nuclei
The ________ glands are located above each kidney.
A. thyroid B. adrenal C. pineal D. ovarian