Assume that the extracellular [Ca2+ ]=1.2mM and the intracellular [Ca2+ ] = 0.1 microMeters. A. Calculate...
Assume that the extracellular [Ca2+ ]=1.2mM and the intracellular [Ca2+ ] = 0.1 microMeters.
A. Calculate the equilibrium potential for Ca2+ .
B. If a channel were to open when Em= -50mV , which way could Ca2+ would go?
C.Is this a positive or negative current?
Homework Answers
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Assume that the extracellular [Ca2+ ]=1.2mM and the
intracellular [Ca2+ ] = 0.1 microMeters.
A. Calculate...
please write thorough answers thanks PART 1 Answer ONLY ONE of the following TWO questions of...
please write thorough answers thanks
PART 1 Answer ONLY ONE of the following TWO questions of Part 1 ie a) OR b) a) A typical, healthy nerve cell in the body has intracellular and extracellular Na, K and Cl' concentrations as shown below. Na concentration: Extracellular: = 150 mm K concentration: Extracellular: = 4 mm Ci concentration: Extracellular: = 100 mm Temperature = 37°C (303.3K) R (the Universal Gas constant) = 8.315 VCmol'k F (Faraday's constant) = 96,485 Cmol Intracellular:...
SHOW YOUR WORK, PLEASE WRITE LEDGIBLY AND CLEARLY 1. Patch clamp recording of a single ion...
SHOW YOUR WORK, PLEASE WRITE LEDGIBLY AND CLEARLY 1. Patch clamp recording of a single ion channel yields the following results: Holding Potential Measured Current (mV) 100 50 (pA) 1.0 0.0 +50 +100 +2.0 +3.0 A) Draw a graph of the current (on the vertical axis)-voltage relation for this channel. B) What is the electrical resistance (in ohms) of this channel? (keep in mind mVa 103 volts, pA 101 amperes, and an ohm is a derived unit that is equivalent...
25. A woman runs a marathon in 30°C weather and replaces all volume lost in sweat by drinking dis...
25. A woman runs a marathon in 30°C weather and replaces all volume lost in sweat by drinking distilled water. After th A) decreased total body water (TBW) B) decreased haematocrit C) decreased intracellular fluid (ICF) volume e marathon, she will have decreased plasma osmolarity increased intracellular osmolarity 26. Which of the following ions has a higher concentration in intracellular fluid (ICF) than in extracellular fluid (ECF)? C1 D) HC03 E) Ca2+ 27. One gram of mannitol was injected into...
Imagine you insert a stimulating electrode into a "typical" neuron in your arm, so that you...
Imagine you insert a stimulating electrode into a "typical" neuron in your arm, so that you can inject any amount of depolarizing or hyperpolarizing current that you want into the cell. Assume for the sake of this question that doing so will not alter the ionic concentration gradients in your tissue, kill the cell, or damage any of the normal components of the cell. Is there any way that you could create a situation where K^+ ions were diffusing on...
Please help me with several of these questions, thank you very much. 1. During the propagation...
Please help me with several of these questions, thank you very much. 1. During the propagation of an action potential along the axon of a neuron, what is happening at the leading edge (the front) of the region of depolarization as it moves down the axon? a. Ligand-gated Na+channels are opening. b. Voltage-gated Na+channels are opening. c. Ligand-gated K+channels are opening. d. Voltage-gated Na+channels have become inactive and refractory. e. Voltage-gated Na+channels are closing. 2. During transcellular transport of glucose...
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4. Inspired by the natural design of cell membranes, you have invented a strange new semi-permeable membrane consisting of a water-impemeable base layer interspersed with hydrophilic transmembrane glycoproteins which form three types of channels. Channel type 'A' is approx imately 3 angstroms in diameter and lined with negative charges Channel type 'B' is approximately 3 angstroms in diameter also but lined with positive charges Channel type C is approximately 4 angstroms in diameter and electrically neutral This membrane separates two...
HOMEWORK FOR LAB 7 KIRCHHOFF'S CIRCUIT RULES Find the equivalent resistance of the followine etwock. Alles...
HOMEWORK FOR LAB 7 KIRCHHOFF'S CIRCUIT RULES Find the equivalent resistance of the followine etwock. Alles in ohms.) Show your work below. 1. network (All resistances are potential 2. Show on the circuit diagram in Question 1 how you would connect a mu meter to measure the current through the 8-n resistor a. Explain why the multimeter is connected in this way. has a low vesitity so it would difference. b. What characteristic of a good multimeter allows you to...
A membrane consisting only of phospholipids undergoes a sharp transition from the crystalline form to the...
A membrane consisting only of phospholipids undergoes a sharp transition from the crystalline form to the fluid form as it is heated. However, a membrane containing and 80% phospholipid and 20% cholesterol undergoes a more gradual change from crystalline to fluid form when heated over the same temperature range. Explain why. Purification of transmembrane proteins requires the addition of detergents to the buffets in order to solubilize the proteins. (a) Why would transmembrane proteins be insoluble if the detergent were...
Will a penny be slightly more massive if it has a negative or a positive net...
Will a penny be slightly more massive if it has a negative or a positive net charge? (Think very small!!) (a) It will be just as massive either way. (b) More massive if negative. (c) More massive if positive. A charged conducting object is brought close to a neutral insulating object. Which of the following is true? (a) The objects will repel. (b) The objects will attract. (c) Nothing will happen, no attraction, no repulsion. (d) The objects will repel...
Write a paper on: Assume that you have been assigned as the project manager for a...
Write a paper on: Assume that you have been assigned as the project manager for a project. Explain how you would go about estimating project tasks and project duration. Describe how you would apply estimating, scheduling, work breakdown structures, project plans, safety, change control, project baselines and the concept of a critical path, which you would choose for your project, and rational why. Also explain who you would involve in the estimation process and when you would involve them. Keep...
please write thorough answers thanks
PART 1 Answer ONLY ONE of the following TWO questions of Part 1 ie a) OR b) a) A typical, healthy nerve cell in the body has intracellular and extracellular Na, K and Cl' concentrations as shown below. Na concentration: Extracellular: = 150 mm K concentration: Extracellular: = 4 mm Ci concentration: Extracellular: = 100 mm Temperature = 37°C (303.3K) R (the Universal Gas constant) = 8.315 VCmol'k F (Faraday's constant) = 96,485 Cmol Intracellular:...
SHOW YOUR WORK, PLEASE WRITE LEDGIBLY AND CLEARLY 1. Patch clamp recording of a single ion channel yields the following results: Holding Potential Measured Current (mV) 100 50 (pA) 1.0 0.0 +50 +100 +2.0 +3.0 A) Draw a graph of the current (on the vertical axis)-voltage relation for this channel. B) What is the electrical resistance (in ohms) of this channel? (keep in mind mVa 103 volts, pA 101 amperes, and an ohm is a derived unit that is equivalent...
25. A woman runs a marathon in 30°C weather and replaces all volume lost in sweat by drinking distilled water. After th A) decreased total body water (TBW) B) decreased haematocrit C) decreased intracellular fluid (ICF) volume e marathon, she will have decreased plasma osmolarity increased intracellular osmolarity 26. Which of the following ions has a higher concentration in intracellular fluid (ICF) than in extracellular fluid (ECF)? C1 D) HC03 E) Ca2+ 27. One gram of mannitol was injected into...
4. Inspired by the natural design of cell membranes, you have invented a strange new semi-permeable membrane consisting of a water-impemeable base layer interspersed with hydrophilic transmembrane glycoproteins which form three types of channels. Channel type 'A' is approx imately 3 angstroms in diameter and lined with negative charges Channel type 'B' is approximately 3 angstroms in diameter also but lined with positive charges Channel type C is approximately 4 angstroms in diameter and electrically neutral This membrane separates two...
HOMEWORK FOR LAB 7 KIRCHHOFF'S CIRCUIT RULES Find the equivalent resistance of the followine etwock. Alles in ohms.) Show your work below. 1. network (All resistances are potential 2. Show on the circuit diagram in Question 1 how you would connect a mu meter to measure the current through the 8-n resistor a. Explain why the multimeter is connected in this way. has a low vesitity so it would difference. b. What characteristic of a good multimeter allows you to...
A membrane consisting only of phospholipids undergoes a sharp transition from the crystalline form to the fluid form as it is heated. However, a membrane containing and 80% phospholipid and 20% cholesterol undergoes a more gradual change from crystalline to fluid form when heated over the same temperature range. Explain why. Purification of transmembrane proteins requires the addition of detergents to the buffets in order to solubilize the proteins. (a) Why would transmembrane proteins be insoluble if the detergent were...
Will a penny be slightly more massive if it has a negative or a positive net charge? (Think very small!!) (a) It will be just as massive either way. (b) More massive if negative. (c) More massive if positive. A charged conducting object is brought close to a neutral insulating object. Which of the following is true? (a) The objects will repel. (b) The objects will attract. (c) Nothing will happen, no attraction, no repulsion. (d) The objects will repel...
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