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
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1 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
2 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
3 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
4 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
5 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
6 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
7 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
8 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
9 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
10 Cell Membrane
11 Cell Membrane
12 Cell Membrane
13 Cell Membrane flexible, selectively permeable boundary that controls what enters and leaves the cell
14 Cell Membrane flexible, selectively permeable boundary that controls what enters and leaves the cell selectively permeable:
15 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
16 Cell Membrane
17 main component: Cell Membrane
18 Cell Membrane main component: phospholipids
19 Cell Membrane main component: phospholipids
20 Cell Membrane main component: phospholipids phosphate head:
21 Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water)
22 Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water) two lipid tails:
23 Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water) two lipid tails: hydrophobic (fears water)
24 Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water) two lipid tails: hydrophobic (fears water)
25 Cell Membrane main component: phospholipids phosphate head: hydrophilic (likes water) two lipid tails: hydrophobic (fears water) form a phospholipid bilayer:
26 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
27 other components: transport proteins: Cell Membrane
28 Cell Membrane other components: transport proteins: a protein that helps move materials through the cell membrane
29 other components: cholesterol: Cell Membrane
30 Cell Membrane other components: cholesterol: prevents fatty acids from sticking together, keeps membrane fluid
31 other components: carbohydrates: Cell Membrane
32 Cell Membrane other components: carbohydrates: cell recognition and cell communication
33 Cell Membrane
34 fluid mosaic model: Cell Membrane
35 Cell Membrane fluid mosaic model: the model used to describe the cell membrane
36 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
37 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
38 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
39 Cell Membrane
40 Cell Membrane
41 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?
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