Here, weâre concerned, like Lord Chesterfield, with âthe average cat.â On average, female cats live one to two years longer than male cats. On average, indoor cats live longer than outdoor cats. On average, wild, homeless, and feral cats live dramatically shorter lives than domestic cats.
During contraction, myosin heads bind to actin molecules of the. thin filaments. Flexing of the myosin heads pulls the thin filaments over the thick. filaments - shortening the sarcomere. Muscle contraction requires.
The hamstring contracts [Contract: A muscle tenses as fibres shorten.] , pulling the lower leg up and causing the knee to bend. At this time, the quadricep relaxes [Relax: When muscle fibres stop contracting.] . To straighten the knee, the quadricep contracts, and pulls the lower leg down.