What causes the movement of calcium and sodium ions in and out of cardiac cells?
A. charged particles in the phospholipid bilayer
B. cholesterol molecules in the phospholipid bilayer
C. diffusion channels in the cell membrane
D. transport proteins in the cell membrane
lear

2points what is the term for a female reproductive cell? a. egg b. chromatid c. allele d. fertilization

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

1. describe the structure and function of the specialized cells you observed in the video. 2. research the types of cells present in the kidney.