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.
Appearance. British Labrador retrievers are smaller than the American type. A British Lab matures at 50 to 70 pounds, while the American Lab's weight ranges between 60 and 90 pounds.With both types, males are larger than females.The English Lab has shorter legs and a more dense coat than his American counterpart.ppearance. British Labrador retrievers are smaller than the American type. A British Lab matures at 50 to 70 pounds, while the American Lab's weight ranges between 60 and 90 pounds.