The three types of muscle found in the human body are the smooth, the striated and the cardiac muscle.
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Skeletal muscles form the active part of the locomotor system: they move the bones they are attached to.
This animation demonstrates the fine molecular structure and mechanism of muscles.
The arms are moved by flexor and extensor muscles.
The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.
The withdrawal reflex is a spinal reflex that ensures moving away from potentially damaging stimuli.
The spinal cord is the part of the central nervous system running inside the spinal column from which spinal nerves branch out.
Eukaryotic cells contain a number of organelles.
Bones of the lower limbs are connected to the trunk by the pelvis.
Bones of the upper limbs form the pectoral girdle and the arms.
Connective tissues include loose and dense connective tissues, adipose tissue, blood, tendon and bone tissue.
The skin is the soft outer covering of our body, its three layers are the epidermis, the dermis and the hypodermis.
This animation presents levels of biological organisation from the level of the individual organism to the level of cells.
Neurons are cells specialised for transmitting electric signals.
The heart generates the electrical impulses necessary for its own operation. The graphic representation of the electrical activity of the heart is the...
The heart is the central pump of the cardiovascular system beating several billion times over our lifetime.
Human blood consists of blood cells and plasma.
Surface epithelia cover the external and internal surfaces of the body.
The cause of a heart attack is the blockage of a coronary artery. It is one the most common causes of death.