The type of muscle fibers that have only a single nucleus, both thick and thin filaments, but no Z discs, are
A. skeletal.
B. cardiac.
C. smooth.
D. cardiac and smooth.
E. cardiac and skeletal.
C
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This figure shows a frontal section of the kidney. Which number indicates the renal pelvis?
A. 1 B. 2 C. 4 D. 8 E. 9
Select all that have regulated reabsorption.A) GlucoseB) SodiumC) WaterD) Calcium
What will be an ideal response?
Blood O2 levels
A. within the normal PO2 range have little effect on regulation of respiration. B. never change enough to influence respiration. C. are more important than CO2 levels in the regulation of respiration. D. in venous blood and arterial blood are about the same. E. need to change only slightly to cause a change in respiration rate.
What is true about the sex chromosomes?
A) Normal males possess two sex chromosomes that look the same, X and X. B) Normal females possess two sex chromosomes that look different, X and Y, and normal males possess two sex chromosomes that look the same, X and X. C) Normal females possess two sex chromosomes that look different, X and Y. D) Possession of the Y chromosome determines maleness.