Chapter 32.3, Problem 1NV

Summary Introduction

To define:

Smooth muscle, involuntary muscles, cardiac muscle, skeletal muscle, voluntary muscle, tendon, myofibril, myosin, actin, and sarcomere.

Explanation of Solution

Smooth muscle:It is a type of muscle which lacks striation and are involuntary.

Involuntary muscles: These muscles are not directed by will and consciously controlled.

Cardiac muscle: These are the muscles of heart. They are transversely striped and involuntarily controlled.

Skeletal muscle: It is a muscle that is connected with the skeleton, that is bone and cartilage and they help in locomotion and movement. They are generally controlled constantly.

Voluntary muscle:These muscles are directed by will and consciously controlled.

Tendon: It is a fibrous connective tissue that is responsible for bones to the muscles.

Myofibril:It is a basic structure of the muscle that is rod like. Many myofibrils are chained together to form the myocytes or a muscle fiber.

Myosin and Actin:Myosin is a motor protein most that is involved in muscle contraction. Actin is a spherical protein which forms filaments and are also responsible for the contraction of muscles.

Sarcomere: It is a contractile unit of the muscle that is composed of actin and myosin filaments.