Question

Which type of muscle is found in the heart?
(a)Cardiac
(b)Skeletal
(c)Smooth
(d)All of the above

Answer 1

Hint: A muscle is defined as soft tissue. It is found in animals and contains certain protein filaments of actin and myosin that helps in the production of contraction which changes the length and shape of the cell. It helps in motion and the production of force.

Complete answer:
The muscles that are found in the heart are the cardiac muscles which are of three types. It comprises vertebrate muscles, skeletal muscles, and smooth muscles which are involuntary, striated muscles that constitute the walls of the heart. The outer layer of the heart wall which is known as epicardium and the inner layer which is known as endocardium constitutes a middle layer which is known as myocardium. The individual heart muscle comprises the coronary circulation which supplies blood and is joined together by intercalated discs that form the extracellular matrix by collagen fibers and other substances. The myocardium forms the bulk of the heart and the heart wall is three-layered which constitutes a thick layer of myocardium between the inner and outer layer. The contracting heart muscles require a lot of energy and use it to provide Oxygen and nutrients to a constant flow of blood.

Additional Information: Skeletal: They are the muscle types which are a form of striated muscle tissues that are voluntary under the control of the somatic nervous system. They are attached to the bones by a bundle of collagen fibers which are known as tendons and are multiple bundles of cells joined together. These are known as muscle fibers which are surrounded by a connective tissue layer known as fasciae. They are composed of myofibrils which constitute actin and myosin filaments in repeated units known as sarcomeres which are the basic units of muscle fiber.
Smooth: These muscles are non-striated and are involuntary in action which is divided into single unit and multi-unit smooth muscles. They have a fusiform shape and are known as myocytes. They have greater elasticity e and functions within a larger length-tension curve which can stretch and maintain contractility which is important to the organs like intestine and urinary bladder.

So, the correct answer is ‘All of the above’.

Note: The human heart can beat continuously if it is disconnected from the body and can be about 115, 000 times a day. The rhythm of the heart is controlled by the cardiac conduction system which is an electrical system. The heart surgery done to the youngest person was only a minute old.