Muscle is excitable because it can be stimulated in order to cause contraction. Stimulation comes from the nervous system via electric signals/action potential that travels frâ¦om neuron through axon to muscle tissue.
Breed Profile--Written By Tiami Coleburg Breed: Labrador Retriever Owner Level: Suitable for some active and involved first time owners. Average Life Span: 12-14 years Average Weight: Male weights range 65-80 pounds. Female weights range 55-70 pounds. Average Weight Male height ranges from 22 1/2 to 24 1/2 inches high at the shoulder. Female height ranges from 21 1/2 to 23 1/2 inches at the shoulder. Color And Coat: True Labrador Retrievers only come in: black, shades of chocolate, and yellow.
During the first 8 weeks of its life the puppy gains about 2 pounds a week. An 8 week old Labrador puppy weighs between 11 and 17 pounds. From 8 weeks to 26 weeks (6 months) this growth proceeds in about the same way-an average six month old Labrador weighs between 50 and 60 pounds. Dogs are heavier than bitches.