& 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
Want to see the full answer?
Check out a sample textbook solutionChapter 14 Solutions
College Physics
Additional Science Textbook Solutions
College Physics (10th Edition)
Physics (5th Edition)
Conceptual Integrated Science
The Cosmic Perspective (8th Edition)
Cosmic Perspective Fundamentals
- The 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 fractional change in the resistance of an iron filament when its temperature changes from 20.2°C to 51.2°C? R-R. R. Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. Need Help? Read Itarrow_forwardIf the blood viscosity is 2.7x10-3 Pa.s, length of the blood vessel is 0.2 m , tubular resistance of the blood vessel is 325 GPa-s/m3, what is the radius of the blood vessel, in mm?arrow_forward
- What 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_forwardWhat 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_forward
- A certain single ion channel is selectively permeable to K+ and has a resistance of 1.15 GΩ , therefore a current of potassium ions through the channel is possible. During an experiment, the channel is open for approximately 1.50 ms while the voltage across the channel is maintained at 89.5 mV. How many K+ ions, ?, travel through the channel during this time?arrow_forwardA 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_forwardPeripheral (vascular) resistance is (A) directly proportional to the length of the vessel (B) directly proportional to the viscosity of the blood (C) inversely proportional to the radius to the fourth power (D) A and B (E) all of the abovearrow_forward
- What is the conductance of a 1.0 mm diameter, 10 cm-long blood vessel filled with blood? Express your answer with the appropriate units. FYI: It will not accept 4.91 x 10^(-6) ohms.arrow_forward12. (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_forwardUse the ECG figure shown to determine the heart rate inbeats per minute assuming a constant time between beats.arrow_forward
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON