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& BIO Essential hypertension Suppose your uncle has hypertension that causes the radii of his 40,000,000 arterioles to decrease by 20%. Each arteriole initially was 0.010 mm in radius and 1.0 cm long. By what factor does the resistance
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- Using the drain characteristic of Fig. a. What is the value of ra for VGs = -1 V? b. What is the value of gm0 at Vps = 10 V? I, (mA) 10- VGs=0 V -1 V -2 V 2 -3 V -4 V 1 2 3 4 6. 7 9 10 11 12 13 14 15 16 17 18 19 20 Vps (V)arrow_forwardThe resistance of a material can be calculated with the following equation: R = ρ L A where ρ is the resistivity, L is the length, and A is the cross-sectional area. What is the resistance of an axon’s membrane segment with a length of 1 mm (enter your answer in units of M Ω)?arrow_forwardWhat is the resistance of the of an axon’s axoplasm segment with a length of 1 mm (enter your answer in units of M Ω)?arrow_forward
- What is the resistance of a 2.0 - mm long axon?arrow_forwardThe velocity of spike propagation is proportional to the following combination of factors: 1 a C, V R„R, m Where a is the radius of the axon, Rm and R; are specific resistances of the membrane and the internal buffer, respectively. If we double the radius and simultaneously increase the concentration of salt inside the axon twice (i.e. R; decreases two times), by how many fold will the velocity change?arrow_forwardFind the radius of the unmyelinated axon (m) with space parameter A = 11 mm, (Resistance of a unit area of the membrane, R =0.2 Q.m?, Resistivity of axoplasm, p. =2 0.m). A. 0.00968 B. 0.00242 C. 0.00484 D. None E. 0.01452arrow_forward
- A fluid-filled catheter is 100 cm long and has a diameter of 1 mm. What is the resistance to the blood flow when the viscosity of blood is 0.0027 Newton-seconds (N-s)/m2. Calculate resistance in GPa-s/m3.arrow_forwardA teapot with a surface area 9 325 cm2 is to be plated with silver. It is attached to the negative electrode & an electrolytic cell containing Silver nitrate (Ag+ NO3-). The cell is Powered by a 12.0- resistance battery and has a 의 son If the density & silver is 1.05 x 104 kg/m³, Over what time Interval does a 0-133-mm Jayer of Silver build up on the teapot?!! 의arrow_forwardA rechargeable battery is labeled for 12 V and 1600 mAh*. How much charge can the battery supply at its rated voltage before needing a recharge? Give your answer in units of kC. *mAh stands for "milliAmp-hours," or 1x10-3 A * 1h.arrow_forward
- 12. (a) Using Eq. AQ=CAV and the data in the Table, calculate the number of ions entering the axon during the action potential, per meter of nonmyelinated axon length. (The charge on the ion is 1.6 x 10-19 coulomb.) (b) During the resting state of the axon, typical concentrations of sodium and potassium ions inside the axon are 15 and 150 millimole/liter, respectively. From the data in the Table, calculate the number of ions per meter length of the axon. Table 13.1 Properties of Sample Axons Hint: 1 F (farad) = 1coulomb/1 volt Property Nonmyelinated axon Myelinated axon Axon radius 5 x 10-m 5 x 10-6 m 1 mole /liter = 6.02 x 1020 particles (ions, atoms, etc. ) Resistance per unit length of fluid cm 6.37 x 10°2/m 6.37 x 10°2/m both inside and outside axon (r) Conductivity per unit length of axon membrane (gm) 1.25 x 10-4 mho/m In the resting state, the axon voltage is -70mV. During the pulse, the voltage changes to about +30mV, resulting in a net voltage change across the membrane of 100…arrow_forwardWhat is the output voltage of a 3 V lithium cell in a digital wristwatch that draws 0.32 mA, if the cell's internal resistance is 1.8 Q? Hint: Draw a circuit diagram of the lithium battery in your notebook. Label all currents and voltages. Enter a value correct to 5 significant figures. V₂ = Varrow_forwardDuring surgery, a current as small as 20 µA applied directly to the heart may cause ventricular fibrillation. If the resistance of the exposed heart is 300 2, what is the smallest voltage that poses this danger? Smallest voltage that poses danger: Think: Does your answer imply that special electrical safety precautions are needed? = Varrow_forward
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