Which of the following processes is under voluntary control?
a. filtration
b. reabsorption
c. urination
d. secretion
e. excretion
C
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In relaxed muscle, calcium is found in high concentration in the
A) myofibril. B) T tubules. C) sacroplasmic reticulum. D) sarcolemma. E) neuromuscular junction.
Multigene families
a. come from a single gene duplication event. b. come from repeated cycles of gene duplication followed by mutation. c. from single point mutations. d. come from exon shuffling. e. come from deletions of genes.
The characteristic ____________of a radioisotope allows us to determine the age of rocks and fossils
using a technique called __________. Fill in the blank(s) with the appropriate word(s).
How does the body recognize "self" cells compared to "nonself" cells?
A. "Self" cells contain a triple layer of phospholipids on their plasma membranes. B. "Self" cells contain spikes on their outer surface. C. "Self" cells are marked by glycoproteins called major-histocompatibility complexes (MHCs). D. "Self" cells contain cytokines on their cell surfaces.