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.
However, there can be as much as a 10-20 pound difference in a Labradorâs weight, depending on the gender. An average full-grown male Labrador Retriever weighs anywhere between 65 and 80 lbs. Males are characteristically larger than females, though are just as prone to becoming overweight. The average female Labrador Retriever can weigh from 55 to 70 lbs, depending on bone structure and diet.