Chapter 9: Muscular System: Histology and Physiology Multiple Choice 1. The capacity of a muscle cell to shorten forcefully is known as A) contractility. B) excitability. C) extensibility. D) elasticity. E) flexibility. Answer: a Level: 1 2. Muscles exhibit the property of excitability. This means that the muscle A) shortens its length. B) recoils to its original resting length. C) stretches beyond its normal length. D) responds to stimulation by the nervous system. E)
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________________________ A C T I V I T Y 1 1 Cell Transport Mechanisms and Permeability Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. ______________________________________________________ __________________________________________________________________________________________________ 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? ______________
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Exercise 1: Cell Transport Mechanisms and Permeability: Activity 2: Simulated Facilitated Diffusion Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. Molecules need a carrier protein to help them move across a membrane because You correctly answered: d. they are lipid insoluble or they are too large. 2. Which of the following is true of facilitated diffusion? You correctly answered: c. Movement is passive and down a concentration gradient. 3. Examples
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Exercise 1: Cell Transport Mechanisms and Permeability: Activity 2: Simulated Facilitated Diffusion Lab Report Pre-lab Quiz Results You scored 75% by answering 3 out of 4 questions correctly. 1. Molecules need a carrier protein to help them move across a membrane because Your answer : c. they are too large. Correct answer: d. they are lipid insoluble or they are too large. 2. Which of the following is true of facilitated diffusion? You correctly answered: c. Movement is passive and down a concentration
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1 Cell Transport Mechanisms and Permeability Name ____________________________________________________________ Lab Time/Date ______________________________ Activity 1 Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. * The size of the pores of the membrane * The size of the molecule diffusing through the membrane 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare
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by firstly‚ defining the purpose of neurons in the body along with a description of the components within a neuron and how they enable information to be passed through the cell membrane and on to other neurons. Secondly‚ the resting potential of a neuron will be explored with relation to the concept of selective permeability and the purpose of the Sodium - Potassium pump. Thirdly‚ the molecular basis of the Action Potential will be explained including a description of hyper polarisation‚ depolarisation
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Beetroot Beetroot is a brilliantly versatile veggie. There are many ways to eat it including the traditional pickled beetroot but also more modern recipes such as marinated beetroot with grilled goat’s cheese and creamy beetroot risotto. To grow beetroot‚ sow 2 seeds every 10cm (4 inches) into a 2cm (0.75inch) deep trench. The children will enjoy using a stick to make the trench
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________ ____________ ________ 1. 2. 3. 4. 5. 6. 7. connective tissue ensheathing a bundle of muscle cells bundle of muscle cells c. contractile unit of muscle a muscle cell thin reticular connective tissue surrounding each muscle cell plasma membrane of the muscle fiber a long filamentous organelle with a banded appearance found within muscle cells actin- or myosin-containing structure cord of collagen fibers that attaches a muscle to a bone d. e. f. g. h. i. j. k. 9. F K ____________ ________
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include: working with potassium and calcium to maintain neuromuscular irritability for conduction of nerve impulses‚ regulation of acid-base balance (through sodium bicarbonate and sodium phosphate)‚ participation in cellular chemical reactions and membrane transport. * Potassium: K+ 3.5-5.0 mmol/L: Potassium maintains the osmotic balance of the ICF space. Potassium is the major intracellular electrolyte and contributes to many important cellular functions including the transmission of nerve
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antagonists and partial agonists) o Enzyme inhibition o Membrane transport systems • Apply your knowledge to explain action and side effects of β blockers and β2 agonists. The Action potential • Transmission is due to movement of ions (Na+ and K+) across nerve cell membrane • Na+ found mainly outside cells – tends to diffuse inwards • K+ found mainly inside cells – tends to diffuse outwards • Stimulation of neurone changes the membrane permeability to ions • Depolarisation occurs as Na+ floods into
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