Calcium is removed from the cytosol of cardiac muscle cells by group of answer choices:

(a) ca2+ atpases in the sarcoplasmic reticulum
(b) ca2+/na+ exchangers in the plasma membrane
(c) ca2+ atpases in the plasma membrane
(d) ca2+ channels in the sarcoplasmic reticulum

The distribution of related animals and plants across the world

Witch theory suggests all living things are made up of cell or cells

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.