a muscle that draws a body part away from the median line

a muscle that draws a body part toward the median line

a tiny sac for holding air in the lungs

a tiny sac for holding air in the lungs

the part of the skeleton that includes the pectoral girdle and the pelvic girdle and the upper and lower limbs

one of the small thin-walled arteries that end in capillaries

the part of the skeleton that includes the skull and spinal column and sternum and ribs

any skeletal muscle having two origins

a distensible membranous sac

the fluid that is pumped through the body by the heart

a vessel in which blood circulates

rigid tissue that makes up the skeleton of vertebrates

the fatty network of connective tissue that fills the cavities of bones

the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus

either of the two main branches of the trachea

a muscle that flattens the cheek and retracts the angle of the mouth

the muscle tissue of the heart

the organs and tissues involved in circulating blood and lymph through the body

any of the eight small bones of the wrist of primates

the portion of the vertebrate nervous system consisting of the brain and spinal cord

anterior portion of the brain consisting of two hemispheres

a semiliquid mass of partially digested food that passes from the stomach through the pyloric sphincter into the duodenum

the organs and tissues involved in circulating blood and lymph through the body

the end of the vertebral column in humans and tailless apes

the ball-and-socket joint between the head of the femur and the acetabulum

the deep vascular inner layer of the skin

the system that makes food absorbable into the body

the system of glands that produce endocrine secretions that help to control bodily metabolic activity

a flap of cartilage that covers the windpipe while swallowing

a skeletal muscle whose contraction extends or stretches a body part

a diagonally arranged abdominal muscle on either side of the torso

the outer and thinner of the two bones of the human leg between the knee and ankle

a skeletal muscle whose contraction bends a joint

that part of the cerebral cortex in either hemisphere of the brain lying directly behind the forehead

a muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion

digestive secretions of the stomach glands consisting chiefly of hydrochloric acid and mucin and the enzymes pepsin and rennin and lipase

a freely moving joint in which the articulations allow only gliding motions

the outermost of the three gluteal muscles

the middle of the three gluteal muscles

the innermost of the three gluteal muscles

a valve to control one-way flow of blood

a freely moving joint in which the bones are so articulated as to allow extensive movement in one plane

a U-shaped bone at the base of the tongue that supports the tongue muscles

a basal part of the diencephalon governing autonomic nervous system

the upper and widest of the three bones making up the hipbone

a system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response

the skin and its appendages

a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)

one of the three sections of the hipbone

either of two bean-shaped excretory organs that filter wastes (especially urea) from the blood and excrete them and water in urine

beginning with the cecum and ending with the rectum

a broad flat muscle on either side of the back

large and complicated reddish-brown glandular organ located in the upper right portion of the abdominal cavity; secretes bile and functions in metabolism of protein and carbohydrate and fat; synthesizes substances involved in the clotting of the blood; synthesizes vitamin A; detoxifies poisonous substances and breaks down worn-out erythrocytes

either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood

the interconnected system of spaces and vessels between body tissues and organs by which lymph circulates throughout the body

the source of lymph and lymphocytes

a large muscle that raises the lower jaw and is used in chewing

the jaw in vertebrates that is fused to the cranium

lower or hindmost part of the brain

insoluble pigments that account for the color of e.g. skin and scales and feathers

any bone of the hand between the wrist and fingers

a neuron conducting impulses outwards from the brain or spinal cord

the muscular system of an organism

any of the small tubules that are the excretory units of the vertebrate kidney

the sensory and control apparatus consisting of a network of nerve cells

that part of the cerebral cortex in either hemisphere of the brain lying in the back of the head

a large elongated exocrine gland located behind the stomach

originates in the brain stem and lower part of the spinal cord; opposes physiological effects of the sympathetic nervous system: stimulates digestive secretions; slows the heart; constricts the pupils; dilates blood vessels

that part of the cerebral cortex in either hemisphere of the brain lying below the crown of the head

either of two large muscles of the chest

a dense fibrous membrane covering the surface of bones (except at their extremities) and serving as an attachment for tendons and muscles; contains nerves and blood vessels that nourish the enclosed bone

the section of the nervous system lying outside the brain and spinal cord

the master gland of the endocrine system

a freely moving joint in which movement is limited to rotation

the terminal section of the alimentary canal

a mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues; a biconcave disc that has no nucleus

organs and tissues involved in the production and maturation of gametes and in their union and subsequent development as offspring

the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing

any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates)

a muscle in the thigh that helps to rotate the leg into the sitting position assumed by a tailor; the longest muscle in the human body

flat triangular bone on the side of the shoulder in humans

a neuron conducting impulses inwards to the brain or spinal cord

a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes

the hard structure (bones and cartilages) that provides a frame for the body of an animal

the longest part of the alimentary canal

a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)

a broad flat muscle in the calf of the leg under the gastrocnemius muscle

a ring of muscle that contracts to close an opening

a major part of the central nervous system which conducts sensory and motor nerve impulses to and from the brain; a long tubelike structure extending from the base of the brain through the vertebral canal to the upper lumbar region

originates in the thoracic regions of the spinal cord

any bone of the tarsus

muscle extending from the temporal fossa to the coronoid process of the mandible; acts to raise the mandible and close the jaws

that part of the cerebral cortex in either hemisphere of the brain lying inside the temples of the head

any of several muscles that cause an attached structure to become tense or firm

the cavity in the vertebrate body enclosed by the ribs between the diaphragm and the neck and containing the lungs and heart

a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity; atrophies with age

the inner and thicker of the two bones of the human leg between the knee and ankle

either of two skeletal muscle in each leg arising from the tibia; provides for movement of the foot

a mobile mass of muscular tissue located in the oral cavity

either of two masses of lymphatic tissue one on each side of the oral pharynx

either of two flat triangular muscles of the shoulder and upper back that are involved in moving the shoulders and arms

any skeletal muscle having three origins

one of the first seven ribs in a human being which attach to the sternum

the inner and longer of the two bones of the human forearm

either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder

duct through which urine is discharged in most mammals and which serves as the male genital duct

the system that includes all organs involved in reproduction and in the formation and voidance of urine

a minute vein continuous with a capillary

a minute hairlike projection on mucous membrane

striated muscle that can be controlled voluntarily

blood cells that engulf and digest bacteria and fungi