Question

Which of the following muscles are striated and innervated by the autonomic nervous system?
A. Skeletal muscles
B. Smooth muscles
C. Cardiac muscles
D. Both A and B

Answer 1

Hint: The human musculature consists of muscle tissue. The human body has 639 muscles. The tissue consists of long, narrow, highly specialized cells which are referred to as muscle fibers. There are 3 sorts of muscles in vertebrates -striated, smooth, and cardiac muscles.

Complete answer:
-Skeletal muscle contains a series of muscle fibers that are made of muscle cells. Moreover, these muscles happen to be long and multinucleated. At the ends of every muscle, there is an association of a muscle to the bone that takes place with the assistance of the tendon. This specific sinew connects to the epimysium of skeletal muscle’s collagenic outer covering in an exceedingly direct manner.
-Smooth muscle fibers are fusiform or spindle in shape and have one nucleus. Though they do not have striations and sarcomeres, smooth muscle fibers do have simple protein and globulin contractile proteins and thick and thin filaments. Smooth muscle isn't beneath voluntary management, thus, it's referred to as involuntary muscle.
-Cardiac muscle (heart muscle) is associated with the involuntary muscle that's found within the walls and microscopic anatomy of the heart, specifically the heart muscle known as myocardium. Cardiac muscle is one of all three major sorts of muscle. Cardiac muscles are striated and innervated by an involuntary system.
-Cardiac muscle is characterized by stripy muscle fibers, connected along by intercalated discs, where the membranes are specialized to permit electrical signals to pass through. Similar to smooth muscles, cardiac muscles will stay in contraction for a sustained amount of time. Like skeletal muscles, cardiac muscles conjointly contract quickly. The formation of contracted proteins in muscle cells permits stronger contractions once the fibers are stretched, which makes the center pump a lot of blood with efficiency.

Therefore, the right answer is choice C.

Note: Muscle comes from the germ layer of the embryonic germ layers. Cardiac muscles are one of the three varieties of vertebrate muscles. Cardiac muscles or involuntary muscles assist in rhythmic contraction and relaxation of the center. Cells area unit cylindrical branched.