Heart rate is the number of heartbeat cycles per minute, and a heartbeat cycle, also called cardiac action, includes the beating phases of systole and diastole. Systole refers to the contraction of the ventricles including blood ejection phase and diastole refers to the resting phase of the ventricles with simultaneous contraction of the atria and … Heart Rate: Function, Tasks, Role & Diseases
Baroreceptors are mechanoreceptors in human arteries and veins that regulate blood pressure. They are connected to the medulla oblongata and register changes in blood pressure and heart rate. By keeping blood pressure constant, they perform important tasks in maintaining circulation. What is a baroreceptor? One of the most important sensory cells in the sense of … Baroreceptor: Structure, Function & Diseases
The visual pathway refers to special-somatosensitive fibers that run from the retina of the eye to the visual cortex of the brain. The complex structure of the visual pathway makes human vision possible. What is the visual pathway? The visual pathway is a component of the brain. Thus, all components originate in this region of … Visual Pathway: Structure, Function & Diseases
The aortic arch is effectively a 180-degree elbow of the body’s aorta, transferring the nearly vertical upward ascending aorta to the nearly vertical downward descending aorta. The aortic arch lies just outside the pericardium above the origin of the ascending aorta, which originates in the left ventricle. Three arteries or arterial trunks branch from the … Aortic Arch: Structure, Function & Diseases
Pinched nerves are manifested by a sudden pain in the lateral chest region. The affected nerves emerge from the spinal canal between each vertebra and pass just below the ribs, along with one artery and one vein each. Often, however, the sensation of “pinched nerves” is not actually a pinch, but merely nerve irritation occurring … Home Remedies for Pinched Nerves
The pubic bone is one of the bones of the body and, together with the ilium and ilium, forms the pelvis. Together with the other pelvic bones, it also forms the acetabulum. In women, it lies lower than in men. What is the pubic bone? The pubic bone (called Os pubis in Latin) refers to … Pubic Bone: Structure, Function & Diseases
Vascular surgery eliminates disorders and diseases of the blood vessels, for example, vascular stenosis or varicose veins through the conservative (non-invasive) or surgical therapies. It is a subspecialty of surgery. A commonly performed operation to eliminate vascular disorders is the placement of bypasses and vascular prostheses. What is vascular surgery? Vascular surgery is concerned with … Vascular Surgery: Treatment, Effect & Risks
A vascular prosthesis is an implant that replaces natural blood vessels. It is mainly used for chronic vasoconstriction, bypass surgery or severe vasodilatation. What is a vascular prosthesis? A vascular prosthesis is an implant that replaces natural blood vessels. It is used primarily for chronic vasoconstriction (see illustration), bypass surgery, or severe vasodilatation. A vascular … Vascular Prosthesis: Treatment, Effect & Risks
An arteriosclerosis, atherosclerosis is mostly also called arteriosclerosis. In this case, in the course of an unhealthy lifestyle, mostly deposits of cholesterol, fat and calcium (plaque) occur in the arteries, which then do not allow enough blood or oxygen through due to a narrowing of the arteries. What is arteriosclerosis? The popularly known disease of … Atherosclerosis: Causes, Symptoms & Treatment
Definition When we talk about capillaries (hair vessels), we usually mean the blood capillaries, although we must not forget that there are also lymph capillaries. Blood capillaries are one of three types of vessels that can be distinguished in humans. There are the arteries that transport the blood away from the heart and the veins … Capillary
Structure of capillaries The structure of a capillary resembles a tube. The diameter of a capillary is about five to ten micrometers. Since the red blood cells (erythrocytes) that flow through the capillaries have a diameter of about seven micrometers, they must deform somewhat when they flow through the small blood vessels. This minimizes the … Structure of capillaries | Capillary
Functions of capillaries The function of the capillaries is mainly mass transfer. Depending on where the capillary network is located, nutrients, oxygen and metabolic end products are exchanged between the bloodstream and the tissue. Nutrients are supplied to the tissue, waste products are absorbed and carried away. Depending on the oxygen requirement of a particular … Functions of capillaries | Capillary
