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.
The Life Expectancy Of Labrador Retrievers. The life expectancy of Labrador Retrievers can be anything between 10 and 14 years. Just as with humans, that figure can vary widely, but a good average for Labradors is 12 or 13. Of course, good care and balanced feeding, regular exercise and plenty of mental stimulation, frequent health checks at the vets as well as freedom from disease can ensure that your lab enjoys a good long life.