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.
For most Labs, this will be 70-80 lbs. Male dogs will usually be heavier. In 15 months, the Labrador retriever puppy (born around one lb) multiplies his birth weight by 70 or more! Most Lab puppies are around 10 lbs at eight weeks of age and reach 50 lbs at around seven months of age. As a rule of thumb, they will gain 2 lbs a week until they are about 26 weeks old.