Which of the following does not belong grouped with the others?
A. Zona pellucida
B. Allantois
C. Yolk sac
D. Amnion
Answer: A
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________ tissue exhibits the characteristics of excitability, contractility, and elasticity
A) Connective B) Nervous C) Muscle D) Epithelial
Which of the following statements is true about positive and negative lymphocyte selection?
A) Only positive selection is needed for proper functioning of the immune system. B) It is necessary to have lymphocytes that can fight foreign objects in the body without harming its own tissues. C) In both instances, lymphocytes die after they do their job. D) In both instances, antigens do not recognize pathogens in the body.
Which type of nephron is essential for water conservation and concentrated urine production?
A) juxtamedullary nephrons B) cortical nephrons C) medullary nephrons D) pyramidal nephrons E) pelvic nephrons
The kidneys neutralize more acid or base than any other buffer system
Indicate whether the statement is true or false