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KIN 3600

Lec 15

What is BMR? The rate of energy expenditure during absolute rest
What is MET? Resting energy expenditure. -3.5 ml-kg-min
Why do we create the unit of MET? -express intensity of exercise of various types of activity -also, able to calculate
If you know the weight (kg) of a person you can calculate energy expenditure of that activity
Resting VO2 is unknown You can estimate rate of energy expenditure
Find Estimated VO2 weight (kg) x 1 MET (3.5) x intensity MET
Convert VO2 to E.E Estimated rate E.E = Estimated VO2 x 5Kcal
If you have resting VO2 Actual rate E.E. = resting VO2 x intensity x 5Kcal
What is mechanical efficiency Mechanical work relative to the total amount of energy transformed during and exercise
Energy equivalent of O2 4.82 or 5.0 Kcal/LO2
1 Kcal 4186.85 J or 4186.85 Nm
Energy input = VO2 x Energy expenditure of O2
Energy output = 1 J-sec X seconds in 1 min / 1 Kcal
M.E. (gross) = Output / Input x 100%
Net O2 consumption = VO2 – BMR in Liters
Net energy input = O2 consumption x Energy expenditure
M.E. (NET) = GROSS energy output / Net energy input x 100%
Functions of Nervous system sensory, integrative and motor
sensory function allows the body to gather information from both within and outside the body
integrative function is how the gathered information is processed
motor function in which the effectors are able to act
Central nervous system (CNS) brain & spinal cord
Perineural Nervous system (PNS) -is to connect the CNS to the limbs and organs, essentially serving as a relay between the brain and spinal cord and the rest of the body -not protected by the vertebral column and skull, or by the blood–brain barrier, which leaves it exposed to injuries
Afferent neurons SENSORY neurons that carry nerve impulses from sensory stimuli TOWARDS the central nervous system and brain
Efferent neurons MOTOR neurons that carry neural impulses AWAY from the central nervous system and towards muscles to cause movement
Characteristics of Neurons polarized -Excitability -Conductivity
Polarized Electrically charged neuron
Excitability ability to respond stimuli - ability transmit electrical impulses
Conductivity ability transmit electrical impulses
Electrical Activity of Neurons -Amino acids -ATP & CP -HCO3 ----> Negative charge & cannot go outside the cell
inside the cell extremely negative
outside the cell positive
Electrical gradient Positive & Negative charge gradient
Chemical or Diffusion gradient high to low concentration
Electro-chemical equilibrium Potassium ions only can go inside the cell
Resting membrane Potential unstimulated (-70mV)
What will happen if 1 ion get out of the cell - 1 cell moves out - 1 cell comes in restoring electro-chemical balance
Sodium (Na+) - Will sneak in b/c electrical force will try to pull it inside the cell - Not supposed to come inside only K+
What happens when Na+ comes inside the cell - Inside becomes less negative because of the overwhelming positive charge - K+ exits cell to keep the balance between the charges
Na+/K+ pump – ATPase Special protein in membrane to kick Na+ out and let K+ come back inside
Na+ rushes in & overwhelms the cell & blocks negative charge 0 mV depolarization
What happens to cell membrane potential after geting overwhelmed by Na+ Becomes positive: +30 mV -Na+ gates close to prevent further ^ -Reverse potential: 30mV
What happens to K+ when cell is positive K+ rushes out of the cell to maintain balance -Reestablish equilibrium back to -70mV K+ gates open more than usual causes RMP to become -75mV -It then returns back to normal @ -70mV
Action Potential nerve impulses & complete changes in membrane potential
Created by: rmart11



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