Select the correct statement about lymphocytes.
A) The two main types are T cells and macrophages.
B) B cells produce plasma cells, which secrete antibodies into the blood.
C) T cells are the precursors of B cells.
D) T cells are the only form of lymphocyte found in lymphoid tissue.
B) B cells produce plasma cells, which secrete antibodies into the blood.
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Cross-bridges are formed by ________.
A) F-actin B) troponin C) myosin heads D) synapses
Which of the following does not have an endocrine function?
A. Urinary bladder B. Adipose tissue C. Liver D. Small intestine
Which of the following situations would represent a serious disruption of the homeostasis of the volume and composition of body fluids?
1. Eating a normal meal and drinking a glass of water 2. Normal urination 3. Sweating on a warm day, but drinking lemonade in the shade afterwards 4. Drinking a sports drink after playing a game of basketball with friends 5. Becoming dehydrated as your lifeboat drifts on the empty ocean
answer the questions below:
A. Define stem cells and differentiation, and describe the different types and the extent to which they are present during the life of an individual (include the fertilized egg as well as the adult that eventually results). B. Which of the four tissue types contain populations of stem cells of known function, and what is that function? Which types of tissue have stem cells of unknown function? Do any types of tissue lack stem cells? C. How do fully differentiated cells differ from stem cells? How can stem cells be used in medical treatment? Give examples.