Place the parts of the human circulatory system in order from highest to lowest degree of internal organization

The right answer is mentionned in the picture,

Muscle cell ==> Muscle tissue ==> Heart ==> Human body.

Muscle cell

Myocytes, or muscle fibers, are "cells" capable of contraction (syncytium, fusion of several cells).

Striated myocytes are mainly distinguished from smooth myocytes. The contractile properties of muscle cells arise from the presence of cytoskeletal elements capable of contracting as a result of an increase in intracellular calcium concentration.

Muscle tissue

Muscle tissue is responsible for the movement of the body in its environment or structures within the body. It is thus associated with the skeleton, viscera and components of the circulatory system containing the circulating fluid (blood, hemolymph), which it ensures the setting in motion.

While many cells of multicellular organisms have the property of contracting, some are specialized in performing this function. They are called muscle cells or myocytes, and also referred to as muscle fibers.

Heart

The heart is an essential organ because the body can not function in its absence.

The heart is a muscle whose function is to circulate the blood in the body by acting as a pump by rhythmic contractions. It is able to circulate 4 to 5 liters of blood, permanently, from birth until death. Every day, the heart must beat an average of 100,000 times, and pump 8,000 liters of blood, an average of 2 billion beats in a lifetime.

Human body

The human body is the cultural and physical structure of the body of a human being. The human body consists of several systems (nervous, digestive, etc.). It consists of 206 bones and 639 muscles of which 570 are skeletal muscles.

From top to bottom, we have: the head, the trunk, the upper limbs: the arms, and the lower limbs: the legs.