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skull-present in head regionit is supported on the top of vertebral columnit is made up of the hardest and denest bones in the human bodyit consists
human skeleton -hard supportive or protective elements of the animal body form the skeleton system its study in osteologyexoskeleton -present outside
locomotion in star fish -with the help of tube feet aided by fluid pressure in them in a tube feet upper ampulla middle podium and lower sucker
locomotion in octopus -from the ends of arms or ex-current siphon water is throughn with speed opposite to it animal
locomotion in leech -leech moves by looping action of its body on substratumposterior sucker is attached to base body elongates then anterior sucker
locomotion in earthworm -by contrection amp relaxation of muscles waves are formed in body generally from posterior to anteriorsetae are helpfull in
non-muscular movement -1 streaming movement - in amoeba cyclosis is common2 pseudopodial - in leucocyte
movement of body parts -movement of appendages bring about locomotionperapodia setae in annelida jointed legs in arthropoda flat foot in mollusca
locomotion -displacement of bodymostly animals show locomotion except porifera urochordata corals obelia thier larva may show locomotionits
endocrine glands of an insect -the endocrine glands of cockroach are as follows1 intercerebral gland cells these cells lie in
prostaglandins pgs -because they were first found in semen which is produced partly by the prostate gland they were named
liver -the liver produces a protein angiotensinogen which is changed to angiotensin ii by an enzyme renin secreted by the juxtaglomemlar apparatus of
heart -the cells called cardiocytes of atria of the heart secrete peptide hormone called atrial natriuretic factor anf in response of an increased
placenta -placenta is the intimate connection between the foehls and the uterine wall of the mother to exchange the materialsplacenta is a tempormy
gastro-intestinal mucosa -it develops from the endoderm of the embryoinner most layer of the wall of the alimentary canal is called mucosa certain
kidneys -origin they develop from the mesoderm of the embryothe kidneys secrete three hormones renin erythropoetin and calcitrioli renin whenever the
disorders of the gonadshypogonadism inadequate gonadal function is called hypogonadism it is due to defects in or injury to the hypothalamus the
functions of testosterone -a it stimulates the growth and development of male secondary sex organs like the seminal vesicles prostate and penis it
gonads -they develop from the mesoderm of the embryothe gonads are the sex glands the ovaries and the testes they produce ova and sperms respectively
thymus -it is derived from the endoderm of the embryostructure the thymus gland is located in the upper part of the thorax near the heart it is a
pineal gland epiphysis cerebri -it develops from the ectoderm of the embryothe pineal gland is located between the cerebral hemispheres where it
disorders of the pancreas -i diabetes mellitus hypoinsulinismthe insulin-dependent diabetes mellitus iddm is caused by a failure of the beta-cells to
functions -a it is antagonistic to glucagon insulin decreases the level of glucose in the blood it acts by increasing the rate at which glucose is
hormones of pancreas and their role - i glucagon secreted by a-cellsit stimulates the liver to convert stored glycogen into glucoseglucagon is
adrenal medullathe adrenal medulla develops from the neuroectoderm of the embryomedulla consists of chromaffin cells or phaeochromocytes these cells