Download - Animal Form and Function
Animal Form and Function
Chapter 40
Tissuesorgansorgan systems
• Epithelial– Sheets, tightly packed, protective barrier, outside or inside
• Connective– Supports, binds;cells within a matrix, cartilage, tendons,
ligaments, bone and blood• Muscle
– Actin and myosin; smooth (visceral), skeletal, cardiac– Nervous– Neuron, senses stimuli, transmits signals
Feedback control loops
• Homeostasis– Set point; detect stimulus above or below and return
to set point• Negative
– Response to reduce stimulus; body temp rises, sweat evaporating cools
• Positive– Mechanisms amplify rather that reverse ex. childbirth
Thermoregulation
• Endotherms– Warmed by heat generated by metabolism
• Ectotherms– Gain heat from external sources (behavior)
• Countercurrent exchange– Antiparallel arrangement of blood vessels that warm
blood from core transfers heat to blood from extremities
Animal NutritionChapter 41
Essential Nutrients-required by animal-must get from dietabout half of amino acidsfatty acids-linoleic acidvitamins-B and Eminerals-calcium and phosphorus
Food Processing
• Ingestion• Digestion• Absorption• Elimination• Intracellular vs extracellular digestion• Gastrovascular cavity• Alimentary canals-complete digestive tract
• Peristalsis• Sphincters• Oral cavity• Amylase• Bolus• Pharynx• Epiglottis• Esophagus• Stomach• Gastric juice
– Hydrochloric acid– pepsin
• Acid chyme• Small intestine
– Duodenum• bicarbonate fluid, bile
Chemical DigestionCarbohydrates
Starch and glycogen begin in mouth-salivary amylase
Pancreatic amylase disaccharide maltosemonosaccharides
Proteins
• Pepsin• Trypsin• Chymotrypsin• Dipeptidases• Carboxypeptidase• Aminopeptidase
Absorption
• Villi• Microvilli• Lacteal• Hepatic portal vessel
Hormones
• Gastrin• Enterogastrone• Secretin and cholecystokinin (CCK)
Large intestine
• Colon• Cecum• Appendix• Rectum
Evolutionary adaptations
• Dentition• Length of digestive tract
Circulation and Gas Exchange
• Chapter 42
Problem of Exchange
• Gastrovascular cavity• Circulatory system
– Blood– Vessels– Heart
2 kinds of systems
• Open– Fluid bathes organs– Hemolymph– sinuses
• Closed– Stays in vessels
Vessels
• Arteries• Veins• Capillaries
Variations in animals
• Fish• Amphibians• Reptiles• Mammals and birds
Double Circulation
• Vena cava pulmonary vein• R atrium left atrium• Tricuspid valve bicuspid valve• R ventricle left ventricle• Pulmonary semilunar valve aortic semilunar• Pulmonary arter y aorta• Lungs
Cardiac Cycle
• Systole• Diastole• Heart rate
– Affected by 3 factors-sympathetic nerves speed up; parasympathetic slows; epinephrine increases as does hi body temp
• SA node• AV node• Blood pressure
Lymphatic system
• Lymph• Lymph nodes
Blood
• Plasma• RBCs-erythrocytes-hemoglobin
– Biconcave disks-increases surface area; each contains 250 million molecules of hemoglobin-each binds 4 molecules of oxygen
• WBCs-leukocytes• platelets
Gas Exchange
• Uptake of oxygen and discharge of carbon dioxide
• Partial pressure• Respiratory medium• Respiratory surface
– Moist– Surface area/volume ratio– Closely associated with vascular system
• Gills• Countercurrent exchange• Tracheal systems• Lungs• Larynx• Trachea• Bronchi-bronchioles• Alveoli
Breathing
• Diaphragm• Intercostals• Control• Carbonic acid
Pigments• Hemoglobin-respiratory pigment in most vertebrates• Bohr shift-lowering of pH in blood lowers affinity of
hemoglobin for oxygen• CO2 carried in form of bicarbonate ions (70%), 23%
carried by hemoglobin and 7% in solution of plasma• Carbonic anhydrase-enzyme in RBCs –catalyzes
formation of carbonic acid-dissociates into bicarbonate ion and H ion. As Blood pH drops, rate and depth of respiration will increase
Immune System Chap 43• Innate Immune Response
– Barrier• Skin, mucous membranes• Secretions-keep pH of skin 3-5; lysozyme
– Cellular• Phagocytic WBC
– Neutrophils-ingest-phagocytosis– Monocytes-dev into macrophages– Eosinophils-against parasites
• Antimicrobial proteins– Interferon– Complement system
– Inflammatory response-histamines– Natural Killer Cells
Acquired immunity• Antigens• Antibodies-
• B cells• T cells• Clonal selection• Effector cells• Memory cells• APCs-aka dendritic cells• MHCs
– Class I MHCs-found on all cells except RBCs– Class II MHCs-made by dendritic cells, macrophages and B cells
Responses• Primary• Secondary• Humoral • Cell-mediated
– Helper T– Cytotoxic T– Interleukin I-(type of cytokine)made by macrophages to
activate HelperT– Interleukin II-made by HelperT to stimulate immune
response
• Active immunity• Passive immunity• Antigens on blood cellsblood type• MHCs-organ rejection
• Allergies• Autoimmune• Immune deficiency
Osmoregulation and ExcretionChap 44
• Osmoregulation-control solute concentrations and balance water gain & loss
• Nitrogenous waste-metabolic breakdown of proteins and nucleic acids
• Excretion-remove nitrogenous waste• Transport epithelia-regulate water balance and
waste disposal
Types of N waste
• Ammonia-water soluble and toxic-aquatic • Urea-made by liver of most vertebrates;
combined with carbon dioxide-less toxic, water conserved
• Uric acid-insoluble in water-excreted in paste or crystals-birds&reptiles-can be stored in shelled eggs-not harmful to young
Survey
• Protonephridia/flame-bulb system-platyhelminthes
• Metanephridia-annelida• Malpighian tubules-insects & terrestrial
arthropods• Kidneys-vertebrates
Processes
• Filtration-glomerulus• Reabsorption-proximal and distil tubules• Secretion-proximal tubules• Excretion-filtrate leaves body-urethra• Flow of filtrate in loop of Henle-countercurrent
exchange
Parts page 944
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Regulation
• ADH-made in hypothalamus-stored and released from pituitary; keeps water
• Aldosterone-kidneys absorb more Na, so saves water—helps blood volume and pressue
• Renin-enzyme from kidney-activates angiotension II
• Angiotensin II-acts as hormone, causes arterioles to constrict; makes adrenals release more aldosterone
Hormones and Endocrine SystemChapter 45
Kinases “turn on” processesPhosphotases “turn off” processes
• Endocrine system-all hormone-secreting cells and tissues
• Endocrine glands-ductless-hormones directly into blood
• Hormones-chemical signalsresponse in target cells
• Positive and negative feedback
Cell Signaling
• Cell-surface receptors bind hormone & signal transduction pathway is triggered. – Ex. Epinephrineliver cellscascadeglycogen
glucose• Intracellular receptors-bound by hormones that
are lipid soluble. Receptor acts as transcription factorgene expression– Ex. Estrogen enter nuclei of target cell and stimulate
transcription of certain genes.
• Hormones can affect 1 tissue, a few tissues, most of the tissues, or other endocrine glandstropic hormones.
Hormonal system of communication
• Exocrine-put into a duct or tube• Endocrine-put into blood• Neurosecretory-released by neuron-
hypothalamus
Local Hormones• Growth factors-cause cell replication• Nitric Oxide-from neuron-inhibits process• -from WBC-kills pathogen• -from endothelium of blood vessel-
causes surrounding smooth muscle to dilate-relax
• Prostaglandins-inflammatory response & muscle contraction
• Cytokines-relay messages between WBC’s about pathogens
Hormone reception by cells
• Ligand(hormone) attaches to receptor proteinssignal transduction pathway– Pathway ends in cytoplasm-turn on/off enzyme– Pathway ends in nucleus- turn on/off transcription
• Steroid hormones go through bilayer-don’t need 2nd messengers
Hormonal control mechanisms• Negative feedback loops• Positive feedback loops
Hormones
• Can affect– 1 tissue– A few tissues– Most of the tissues– Other endocrine glands (tropic hormones)
The “Big Dogs”
• Hypothalamus- “Calls the shots”receives info from body and brain-initiates endocrine signals in response
• Pituitary-”Carries out orders”– Posterior
• oxytocin-uterus contraction; let down of milk• ADH-keep water
-
• Anterior pituitary– FSH-ovary or testes-form ova or sperm– LH-stimulates ovaries or testes– TSH-thyroid– ACTH-adrenal cortex-secretes glucocorticoids– GH-growth and metabolic functions– Prolactin-milk production and secretion
Thyroid
• T3 -stimulate and maintain metabolic processes• T4• Calcitonin-lowers blood calcium
Parathyroid glands
• PTH –Parathyroid hormone-raises blood calcium
Pancreas
• Insulin-lowers blood glucose level• Glucagon-raises blood glucose level
Adrenal glands
• Adrenal medulla-epinephrine and norepinephrine-raise blood glucose; increase metabolic act.; Constricts certain blood vessels
• Adrenal cortex– Mineralcorticoids-promote reabsorption of Na+ and
excretion of K+ in kidneys; – Glucocorticoids-raises blood glucose level
Gonads
• Testes-Androgens-support sperm formation; secondary sex characteristics
• Ovaries-estrogens-uterine lining growth; secondary sex characteristics– Progestins-promote uterine lining growth
Pineal gland
• Melatonin-biological rhythms
Negative feedback-more gets you less
• Know at least one example– Thyroid-parathyroid– Pancreas-glucagon and insulin
Positive feedback
• More gets you more• Oxytocin/prostaglandins
Animal Reproduction Chapter 46
• SexualOvum + sperm = zygote• Asexual-fission• Budding-hydra• Fragmentation-sea stars, sponges, cnidarians• Parthenogenesis-unfertilized eggsmale bees-
haploid
Triggers to reproduction
• Ovulation-cyclical-young produced only when viable (day length, temp, rainfall, lunar cycles)
• Hermaphroditism-barnacles, tapeworms• Sex reversal-bluehead wrasse-if male dies,
largest female in harem will become male
Fertilization-union of sperm and egg
• External ferilization• Internal fertilization• Gonads
Female anatomyOvaries-make eggs and hormonesFollicles-contain oocytes-release estrogens• Ovulation-release of egg from follicle• Oviduct-moves egg• Endometrium-inner lining of uterus• Cervix-neck of uterus• Vagina-canal through which baby comes
Male anatomy• Scrotum and penis-external structure• Testes-male gametes and sex hormones• Seminiferous tubules-where sperm are made• Leydig cells-produce testosterone and other
androgens• Epididymis-where sperm mature• Vas deferens-take sperm to urethra• Seminal vesicles, prostate, bulbourethral-contribue
secretions to semen
Spermatogenesis-seminifereous tubules; sperm begin as spermatogonia
4 sperm resultoccurs continuously
Oogenesis-development oogoniaprimary oocytessecondary oocyte
– 1 egg results– Begins prior to female’s birth– Meiosis not completed until after fertilization
Humans and primates have menstrual cycles.Other mammals-estrous cycles
• 1. Menstrual flow phase-endometrium shed• 2. Proliferative phase-endometrium begins to
regenerate• 3. Secretory phase-endometrium continues to
thicken
Ovarian cycle
• Follicular phase• Luteal phase
Pregnancy
• Human Chorionic Gonadotropin (HCG)-made by embryo; maintains the secretion of progesterone and estrogens; detected in urine
• Gestation-carrying embryo in utereus• Parturition-birth
Fertilization
• Contact• Acrosomal reaction• Fusion of sperm and egg membraneion channels
open-fast block to polyspermy-• Entry of sperm nucleus• Cortical reactionfertilization envelope-slow block
to polyspermy• Calcium ion releaseactivation of egg
• Cleavage– Blastomeres– Morula– Blastula-blastocoel
• Gastrulation– Blastopore Archenteron– Ectoderm-skin, lens of eye,nervous system– Mesoderm-skeletal and muscular, excretory,
circulatory,reproductive, blood, bone, muscle– Endoderm
• Epithelial linings, liver, pancreas
• Organogenesis-notochord• Neural plate• Neurulation• Somites
Amniote eggs
• 4 extraembryonic membranes– Amnion-protects– Allantois-disposal sac for waste– Chorion-exchange gases– Yolk sac-nutrients
Mammalian blastocyst] • Inner cell massembryo
• Trophoblast--.fetal portion of placenta• Cytoplasmic determinants-chemical signals such
as mRNAs and transcription factors• Induction-interaction among cells that influences
their fate by causing changes in gene expression• Dorsal lip of blastopore-”organizer” which induces
a series of events that result information of notochord and neural tube
Totipotent Cells
• Capable of developing into all the different cell types of that species
• Mammalian embryos remain totipotent until 16 cell stage
Muscle Contraction
• Neuronacetylcholinesarcoplasmic reticulumCa+bond with troponin which pulls the tropomyosin away from the actin binding site. With ATP, the myosin head is in the high energy position. The myosin head connects with the actin binding site and muscle contraction occurs.