How is the body-fluid composition of hagfishes different from that of other vertebrates? How does this difference figure in the debate about whether vertebrates arose in fresh or salt water?
What will be an ideal response?
Hagfishes have body fluids that have the same ionic concentration as seawater, while other vertebrates have "dilute" body fluids (i.e., about one-third the concentration of seawater), like other marine animals.
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Normally, the stroke volume of the right side of the heart is the same as the stroke volume of the left side of the heart
Indicate whether the statement is true or false
Where is thyrotropin-releasing hormone (TRH) made?
A. anterior pituitary B. hypothalamus C. follicular cells of the thyroid gland D. posterior pituitary
If a pregnant woman is Rh+, she will never produce Anti-Rh antibodies. Which of the following statements is true about her blood?
A. She will develop Anti-Rh antibodies if she carries an Rh- child. B. She will develop Anti-Rh antibodies if she carries an Rh+ child. C. She does not have Anti-Rh antibodies.
The distal end of the humerus articulates with the
A. radius and ulna. B. tarsals. C. tibia and fibula. D. phalanges. E. carpals.