3.1 BIOLOGICAL MEMBRANES 3.1.1 Properties of Cell Membranes • Separates living cell from its nonliving surroundings. • 8 nm thick. • Selectively permeable - allows some substances to cross more easily than others. 4.1.2 Fluid Mosaic Model • Singer and Nicolson (1972) - plasma membrane is a mosaic of proteins dispersed within lipid bilayer‚ with only bilayer‚ the hydrophilic regions exposed to water. Hydrophilic region of protein Phospholipid bilayer Hydrophobic region of protein
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Exercise 2: Skeletal Muscle Physiology: Activity 3: The Effect of Stimulus Frequency on Skeletal Muscle Contraction Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. During a single twitch of a skeletal muscle You correctly answered: b. maximal force is never achieved. 2. When a skeletal muscle is repetitively stimulated‚ twitches can overlap each other and result in a stronger muscle contraction than a stand-alone twitch. This phenomenon is known as
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Class Section ____________________ Reading Module #1 On Your Own This activity in Reading Module 1 gives you two reading passages to practice applying the Active Reading Strategies you have learned. Directions: Complete the activity by reading each passage and answering the questions. Do not forget to spell check and proofread your work. When you have completed this activity‚ please upload it to the Dropbox for this week. Reading #1: “The lie behind those gloomy national polls” by Michael
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The Science of Transportation: Ancient World: The Wheel: • How do they work? Wheels work by rolling along a surface. The curved surface of the wheel reduces the friction between the two surfaces due to a decrease in surface area. With less friction it is much easier to move an object. This is because rolling friction is much weaker than sliding friction. • How did they come to be? The wheel was invented in prehistoric times; as the oldest example of a wheel yet found is from the region of
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Phillips Lab 3: The Cell Purpose During this lab I hope to acquire a complete understanding of the makeup of the cell and all of its functions. Hypothesis If I complete this lab‚ then I will have a full understanding of the topics covered in the chapter “The Cell” and will have a complete understanding of the makeup of the cell and all of its functions. Materials & Methods Materials: “Human Anatomy & Physiology ninth edition” Elaine N. Marieb; Katja Hoehn Methods: 1. Read entire
Free Diffusion Molecular diffusion Osmosis
1. The cell membrane structure is vital to the life of the cell. The cell membrane is shaped as having a phosphate head at the very outer surface‚ and two fatty acid tails hanging from it. The membrane is double‚ so at the tip of the fatty acid tails‚ there are two more fatty acid tails attached to another phosphate head. This is what it looks like: <br> <br>The reason the cell membrane is shaped like this is mainly to control the water flow in and out of the cell. Water is very important to
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membrane and explain the process of active and passive transport through the membrane. The plasma membrane is made up of proteins that form pores and channels‚ carbohydrate molecules that are used for cell recognition and cholesterol to provide membrane stability. Phospholipid molecules are the most abundant component found in the plasma membrane. Phospholipids molecules are composed of a phosphate head and a lipid tail; the structure of a cell membrane is a double layer of these phospholipid
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3 day exercise activity analysis Week 8 12/13/2012 Sci 241 Cassandra I get most of my physical activity from work. I work usually eight hours a day and I am on my feet all day. I do moderate to light work at my job. I also have a two year old son that I have to chase around when I get home and that helps me get physical activity. Doing house work helps me with my physical activity. I like to scrub my kitchen floors at least every other day. I do not use a mop because I feel like it does
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Review Sheet Results (1) 1. List the hematocrits for the healthy male (sample 1) and female (sample 2) living in Boston (at sea level) and indicate whether they are normal or whether they indicate anemia or polycythemia. 1. The hematocrit value for the healthy male: 48 2. The hematocrit value for the healthy female: 44 Both values are normal because they are between the normal ranges: for males between 42-52% and for females between 42-47%. 2. Describe the difference between the hematocrits
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Activity #1 (2 or more errors will result in 3 points) Identify whether each item would appear on the balance sheet (BS) or the income statement (IS) Cash Equipment Rent Expense Insurance Expense Accounts Receivable Supplies Expense Unearned Revenue Supplies Sales Revenue Retained Earnings Identify each item as an “Asset”‚ “Liability” or “Equity”
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