Dirctor

Nervous system:#pathway(stimulus to response)stimulus,receptors,sensory neurone,cns,motorneurone,effectors(glands).receptor recives a stimulus(high temp)it converts it to an electricalimpulse which it reaches sensory neurone, this one carries the impulse from the receptor to the cns.from here,it travels to spinal nervewhere the motor neurone cames the impulseto theeffector.inside it, a muscle carries out an action to deal with stimulus.
#brain: spinal cord: conduce sensory impulses, carry motor impulses.cerebellum: maintance balance,cordinatemovements.cerebrum:is in region connected with intelligence,memory,reasoning.pituitary gland:secret hormones that influence endocrine organs and ANH.medula:breathingrythm,heartreat,swallowing.hypothalamus:detect changes in blood andstimulates pituitary gland.
#heritance genotype:genetic makeup of an organism in termns of alleles present.phenotype:features of an organism due toboth,itsgenotype and its enviroment.homozygous:2identical alleles of a particular gene.heterozygous:2 different alleles of a parti gene.dominant:allele that is expresed when there is no dominatallele.recessive:allele that only is expressed when there is no dominant alele of hte gene.breeds true:when self fertilized,plant,only produce offspring with the same traits.offspring:decendantsof a person,plant, animal considered as a gruop.f1.men:xy women:xx
#Mitosis:process of vell division which gives rise to other identical genes and chromosomes.Ocurrsdeuring cell division of somatic cels.
Meiosis:division in which the chromosome number is halved from diploid to haploid.chromosome:tread on Dna,made up of a stringofgenes.Homologous:A pair of ch which go togheter.Chromatin:not condensed chromatids which cant be distinguished.Chromatid:one of the 2 copies of DNA.sister chromatids:2 identical copiesof chromatid.