Describe the three fundamental features of cells of the innate immune system
What will be an ideal response?
Answer: 1) Cells must recognize the presence of a threat, which requires the ability to distinguish cells from its own body (self) from other material (non-self).
2) Phagocytic cells search out and engulf foreign bodies, digesting them in lysosomes. These cells are also responsible for removing any debris in tissues that results from normal tissue breakdown.
3) Executioner cells target foreign cells, such as bacteria, or host cells that are infected with pathogens, and secrete cytotoxic compounds that either cause the cell to burst or trigger it to undergo apoptosis.
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Excess calcium in the diet causes
A. cracked fingernails. B. brittle teeth. C. stunted growth. D. deposition of calcium in soft tissue.
Answer the following statements true (T) or false (F)
1. Like bone cells, cartilage cells are located in lacunae. 2. Canaliculi supply food and oxygen to cartilage cells. 3. Osteoblasts and osteoclasts do opposite functions in the bone. 4. The skull is formed by endochondral ossification. 5. When fontanels fuse, they form sutures.
What is the major factor controlling how levers work?
A) the structural characteristics of the muscles of the person using the lever B) the weight of the load C) the direction the load is being moved D) the difference in the positioning of the effort, load, and fulcrum
Na+ is always reabsorbed in the ________ but is only reabsorbed in the ________ under hormonal influence.
A. ascending limb of nephron loop; distal convoluted tubule B. ascending limb of nephron loop; proximal convoluted tubule C. descending limb of nephron loop; distal convoluted tubule D. descending limb of nephron loop; ascending limb of nephron loop