The sinus node is a group of cells located in the wall of the right atrium of the heart. These cells can initiate electrical impulses that stimulate the rhythmic contraction of the heart. These impulses then travel from the SA node through specialized heart muscle...
The heart is one of the vital organs in the human body. Every minute, it pumps 4 to 5 liters of blood through the body’s circulatory system. This blood distributes oxygen and nutrients to all the muscles and organs in the body. The heart consists...
The thyroid gland is an endocrine gland located in the neck. It produces hormones that regulate many processes in the human body. It is located at the very front of the neck, and it’s shape resembles a butterfly; it has two lobes that are connected...
The skeletal system is the collection of all the bones in the human body. A full grown and healthy human skeleton consists of 206 bones. Bones come in various different sizes and shapes, and each bone is designed for a specific function. The skeleton plays...
The femur, also known as the thigh bone, is the biggest, strongest, and longest bone in the human body. It is also the only bone in the upper leg. Because of this, it attaches to a lot of different muscles in the upper leg. These...
All movements in the body are made possible by muscles, and respiratory movements are no exception. During inhalation, the diaphragm and intercostal muscles contract, raising the ribcage and increasing the space in the thorax, allowing the lungs to attract more air from outside the body....