BIOB34H3 Lecture Notes - Lecture 17: Cisterna, Myosin, Endoplasmic Reticulum
Document Summary
Attached to boned of the skeleton by tendons (collagen) Makes up 40% of the total body weight. Contracts in response to a signal from a somatic motor neuron. Cannot initiate its own contraction the contraction is not influenced by hormones. Primary muscle of internal organs (except for the heart) Influence the movement of materials around and in and out of the body. Primary extrinsic control arises from autonomic nervous system (ans) Some can contract spontaneously without signals from cns. Primary extrinsic control arises from the autonomic nervous system (ans) Some can contract spontaneously without signal from the cns. Origin: point of muscle where bone attachment is closest to the trunk (usually is more (usually more mobile) Insertion: the point of muscle where the bone attachment is more distal from the trunk. Flexor muscles: brings bones closer together (bicep) Extensor muscles: moves bones away from each other (tricep) Most joints have a pair of muscles flexor and extensor muscles.
