The heart is in the ________ cavity and is covered by the ________
A) thoracic; pleura
B) pericardial; pleura
C) thoracic; pericardium
D) cranial; meninges
E) pericardial; peritoneum
C
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The primary structure of a protein consists of
a) alpha helices. b) beta-pleated sheets. c) three dimensional folded conformation. d) a sequence of amino acids linked by peptide bonds. e) the overall folded conformation of the protein's subunits.
If carbon dioxide levels rise in the body, negative feedback mechanisms will trigger
A. an increase in breathing so that carbon dioxide levels decline to the set point.? B. an increase in breathing so that carbon dioxide levels rise further above set point.? C. a decrease in breathing so that carbon dioxide levels rise to the set point.? D. a decrease in breathing so that carbon dioxide levels decline below set point.
The velocity and pressure of blood is slowest and lowest in the capillary beds. Which of the following is not an accurate description of the benefits of slow, low pressure blood in the capillary beds?
A) Lower pressure on the venus end of the capillary bed allows for greater reabsorption of fluid back to the plasma. B) Slower blood flow through capillaries allows more time for diffusion to take place in the capillary bed. C) Lower pressure in the capillary bed helps to increase pressure in the venus circulation. D) Lower pressure reduces the chance of injury to delicate capillary vessels.
What are the two major divisions of the human skeleton?
A. Limb and trunk B. Axial and limb C. Axial and appendicular D. Appendicular and trunk