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.
About the aging Labrador Retriever. Since the average life span of a Labrador is 10-12 years, you must consider a 7-8 year old Labrador aged and in the later one third of his life.Signs of Aging.The first thing you will see that makes you realize your Labrador is aging is the characteristic graying around the nose, mouth, and eyes.ince the average life span of a Labrador is 10-12 years, you must consider a 7-8 year old Labrador aged and in the later one third of his life. Signs of Aging. The first thing you will see that makes you realize your Labrador is aging is the characteristic graying around the nose, mouth, and eyes.