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Gonorrhoea infection. Computer illustration showing discharge from a penis caused by the sexually transmitted disease gonorrhoea and a close-up view of gonorrhea bacteria. Gonorrhoea is caused by the Gram-negative bean-shaped diplococci Neisseria gonorrhoeae. In many cases it is symptomless, but may cause painful urination or a purulent discharge, as shown here. In severe cases it may also cause inflammation of the testicles and prostate gland, and infertility. Treatment is with antibiotics.
Gonorrhoea infection. Computer illustration showing discharge from a penis caused by the sexually transmitted disease gonorrhoea and a close-up view of gonorrhea bacteria. Gonorrhoea is caused by the Gram-negative bean-shaped diplococci Neisseria gonorrhoeae. In many cases it is symptomless, but may cause painful urination or a purulent discharge, as shown here. In severe cases it may also cause inflammation of the testicles and prostate gland, and infertility. Treatment is with antibiotics.
Heart muscle structure, computer illustration. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.
Heart muscle structure, computer illustration. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.
Heart muscle structure, computer illustration and light micrograph. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.
Heart muscle structure, computer illustration and light micrograph. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.
Heart muscle structure, computer illustration and light micrograph. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.
Computer illustration of a human heart and light micrograph of heart muscle. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.
Computer illustration of a human heart and light micrograph of heart muscle. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.
Heart, computer illustration. The heart is a hollow sac (lower frame) of muscular tissue that pumps blood around the body. Small surface coronary blood vessels supply the heart muscle with blood. Four major blood vessels (upper frame) bring blood to and from the heart. From upper left to centre right they are: the vena cava (the vein returning deoxygenated blood from the body); the aorta (artery through which oxygenated blood is pumped to the body); the pulmonary artery (through which deoxygenated blood is pumped to the lungs); and the pulmonary vein (which returns oxygenated blood from the lungs). The heart can pump 5 litres of blood every minute at rest.
Heart, computer illustration. The heart is a hollow sac (lower frame) of muscular tissue that pumps blood around the body. Small surface coronary blood vessels supply the heart muscle with blood. Four major blood vessels (upper frame) bring blood to and from the heart. From upper left to centre right they are: the vena cava (the vein returning deoxygenated blood from the body); the aorta (artery through which oxygenated blood is pumped to the body); the pulmonary artery (through which deoxygenated blood is pumped to the lungs); and the pulmonary vein (which returns oxygenated blood from the lungs). The heart can pump 5 litres of blood every minute at rest. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.
Heart, computer illustration. The heart is a hollow sac (lower frame) of muscular tissue that pumps blood around the body. Small surface coronary blood vessels supply the heart muscle with blood. Four major blood vessels (upper frame) bring blood to and from the heart. From upper left to centre right they are: the vena cava (the vein returning deoxygenated blood from the body); the aorta (artery through which oxygenated blood is pumped to the body); the pulmonary artery (through which deoxygenated blood is pumped to the lungs); and the pulmonary vein (which returns oxygenated blood from the lungs). The heart can pump 5 litres of blood every minute at rest. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.
