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.
Female Labrador Retrievers go into their first heat between 6 and 24 months of age, which is the same age range that all dogs are given. The Labrador Retriever breed tends to be toward the latter end of this age range due to its larger size. Continue Reading.