Bell Work The stomach is located between the esophagus and the small intestine. The stomach secretes digestive enzymes and strong acids to aid in the digestion of food, playing a very important role in the process of digestion. The stomach is comprised of epithelial tissue, fibrous connective tissue, and smooth muscle tissue. Which of the following best describes the stomach? a. cell c. tissue b. organ d. organ system
Bell Work The stomach is located between the esophagus and the small intestine. The stomach secretes digestive enzymes and strong acids to aid in the digestion of food, playing a very important role in the process of digestion. The stomach is comprised of epithelial tissue, fibrous connective tissue, and smooth muscle tissue. Which of the following best describes the stomach? a. cell c. tissue b. organ d. organ system
Bell Work The stomach is located between the esophagus and the small intestine. The stomach secretes digestive enzymes and strong acids to aid in the digestion of food, playing a very important role in the process of digestion. The stomach is comprised of epithelial tissue, fibrous connective tissue, and smooth muscle tissue. Which of the following best describes the stomach? a. cell c. tissue b. organ d. organ system a. is wrong because cells are comprised of organelles, not tissues
Bell Work The stomach is located between the esophagus and the small intestine. The stomach secretes digestive enzymes and strong acids to aid in the digestion of food, playing a very important role in the process of digestion. The stomach is comprised of epithelial tissue, fibrous connective tissue, and smooth muscle tissue. Which of the following best describes the stomach? a. cell c. tissue b. organ d. organ system
Bell Work The stomach is located between the esophagus and the small intestine. The stomach secretes digestive enzymes and strong acids to aid in the digestion of food, playing a very important role in the process of digestion. The stomach is comprised of epithelial tissue, fibrous connective tissue, and smooth muscle tissue. Which of the following best describes the stomach? a. cell c. tissue b. organ d. organ system c. is wrong because tissues are comprised of cells, not tissues
Bell Work The stomach is located between the esophagus and the small intestine. The stomach secretes digestive enzymes and strong acids to aid in the digestion of food, playing a very important role in the process of digestion. The stomach is comprised of epithelial tissue, fibrous connective tissue, and smooth muscle tissue. Which of the following best describes the stomach? a. cell c. tissue b. organ d. organ system
Bell Work The stomach is located between the esophagus and the small intestine. The stomach secretes digestive enzymes and strong acids to aid in the digestion of food, playing a very important role in the process of digestion. The stomach is comprised of epithelial tissue, fibrous connective tissue, and smooth muscle tissue. Which of the following best describes the stomach? a. cell c. tissue b. organ d. organ system d. is wrong because organ systems are comprised of organs, not tissues
Bell Work The stomach is located between the esophagus and the small intestine. The stomach secretes digestive enzymes and strong acids to aid in the digestion of food, playing a very important role in the process of digestion. The stomach is comprised of epithelial tissue, fibrous connective tissue, and smooth muscle tissue. Which of the following best describes the stomach? a. cell c. tissue b. organ d. organ system
Bell Work The stomach is located between the esophagus and the small intestine. The stomach secretes digestive enzymes and strong acids to aid in the digestion of food, playing a very important role in the process of digestion. The stomach is comprised of epithelial tissue, fibrous connective tissue, and smooth muscle tissue. Which of the following best describes the stomach? a. cell c. tissue b. organ d. organ system b. is right because organs are comprised of tissues
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane flexible, selectively permeable boundary that controls what enters and leaves the cell
Cell Membrane flexible, selectively permeable boundary that controls what enters and leaves the cell selectively permeable:
Cell Membrane flexible, selectively permeable boundary that controls what enters and leaves the cell selectively permeable: able to allow certain materials in, while keeping others out
Cell Membrane
main component: Cell Membrane
Cell Membrane main component: phospholipids
Cell Membrane main component: phospholipids
Cell Membrane main component: phospholipids phosphate head:
Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water)
Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water) two lipid tails:
Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water) two lipid tails: hydrophobic (fears water)
Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water) two lipid tails: hydrophobic (fears water)
Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water) two lipid tails: hydrophobic (fears water) form a phospholipid bilayer:
Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water) two lipid tails: hydrophobic (fears water) form a phospholipid bilayer: two layers of phospholipids, arranged tail-to-tail
other components: transport proteins: Cell Membrane
Cell Membrane other components: transport proteins: a protein that helps move materials through the cell membrane
other components: cholesterol: Cell Membrane
Cell Membrane other components: cholesterol: prevents fatty acids from sticking together, keeps membrane fluid
other components: carbohydrates: Cell Membrane
Cell Membrane other components: carbohydrates: cell recognition and cell communication
Cell Membrane
fluid mosaic model: Cell Membrane
Cell Membrane fluid mosaic model: the model used to describe the cell membrane
Cell Membrane fluid mosaic model: the model used to describe the cell membrane different substances make up the mosaic, and because they can move, it is considered fluid
Cell Membrane fluid mosaic model: the model used to describe the cell membrane different substances make up the mosaic, and because they can move, it is considered fluid
Cell Membrane fluid mosaic model: the model used to describe the cell membrane different substances make up the mosaic, and because they can move, it is considered fluid
Cell Membrane
Cell Membrane
Review Questions 1. What is the cell membrane? 2. What is the function of the cell membrane? 3. What is the term used to describe the ability to choose what may enter and exit the cell? 4. What is the main component of the cell membrane? 5. What is a phospholipid bilayer? 6. Why does the cell membrane form a bilayer? 7. What is the purpose of a transport protein? 8. What is the purpose of cholesterol in the membrane? 9. What is the purpose of carbohydrates in the membrane? 10. Why is the cell membrane described as a fluid mosaic?