Answer the following statements true (T) or false (F)
1. Both monocytes and neutrophils can be called phagocytes.
2. The production of antibodies by T lymphocytes is an important part of the immune system.
3. Eosinophils release important chemicals, such as heparin, that prevent blood clots.
4. Prothrombin activator plus the normal amount of blood sodium converts prothrombin into thrombin.
5. Thrombin reacts with fibrinogen in the plasma to form fibrin.
1. TRUE
2. FALSE
3. FALSE
4. FALSE
5. TRUE
You might also like to view...
Match the following:
A) Epidermal dendritic cells B) Keratinocytes C) Merkel disc D) Keratin E) Cornified keratinocytes 1) The most abundant cells of the epidermis. 2) The protein found in the epidermis that is responsible for toughening the skin. 3) Cells plus a disc-like sensory nerve ending that functions as a sensory receptor for touch. 4) Skin macrophages that help activate the immune system. 5) Cell remnants of the stratum corneum.
Cross bridges
a. extend between the A and I bands and bend to pull the bands together during muscle contraction. b. are formed by the globular heads of the myosin molecules. c. link troponin and tropomyosin to actin to form the thin filament. d. extend from the thick filaments and bind to actin, then bend to pull the thin filaments in closer together during muscle contraction. e. two of these answers.
Which of the following lymphoid tissues removes defective red blood cells from the blood?
A. Lymph node B. Thymus C. Spleen D. Peyer's patches
In a person with myopia (nearsightedness), light from a distant object is brought to a focal point ________
A) behind the retina B) in front of the retina C) on the retina