You can change your booking on ba.com up to 48 hours after the original scheduled time of departure. To make changes after then, you must phone us, or visit a travel shop. All changes must be made within 14 days of the original scheduled departure time.n some cases you will be able to do this on ba.com up to 24 hours prior to the original time of departure. After this point, refunds must be completed offline. Refunds must be completed as soon as possible. The original service fee is not refunded.
Muscular system. Definition. noun. An organ system comprised of skeletal muscles, smooth muscles, and cardiac muscles that are responsible for providing strength, keeping up balance, maintaining posture, allowing movement and producing heat. Supplement.
The muscular system is comprised of the sum total of muscles throughout the body that move the skeleton, maintain posture through steady contraction, and generate heat through cell metabolism.Humans have three types of muscle.Read More.he muscular system is comprised of the sum total of muscles throughout the body that move the skeleton, maintain posture through steady contraction, and generate heat through cell metabolism.