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Methods have also improved dramatically, advancing from the examination of animals by dissection of carcasses and cadavers (corpses) to 20th century medical imaging techniques including X-ray, ultrasound, and magnetic resonance imaging.
Anatomy and physiology, which study (respectively) the structure and function of organisms and their parts, make a natural pair of related disciplines, and they are often studied together.
Obliquely striated muscle is intermediate between the other two.
The filaments are staggered and this is the type of muscle found in earthworms that can extend slowly or make rapid contractions.
Human anatomy is one of the basic essential sciences of medicine.
The discipline of anatomy is divided into macroscopic and microscopic anatomy.
Some of these glands are specialized as mammary glands, producing milk to feed the young.
Mammals breathe with lungs and have a muscular diaphragm separating the thorax from the abdomen which helps them draw air into the lungs.
Sharks and rays are basal fish with numerous primitive anatomical features similar to those of ancient fish, including skeletons composed of cartilage.
Their bodies tend to be dorso-ventrally flattened, they usually have five pairs of gill slits and a large mouth set on the underside of the head.
The dermis is covered with separate dermal placoid scales.
Some species are ovoviviparous and the young develop internally but others are oviparous and the larvae develop externally in egg cases.
The bony fish lineage shows more derived anatomical traits, often with major evolutionary changes from the features of ancient fish.They have a cloaca into which the urinary and genital passages open, but not a swim bladder.