Work Flashcards
The thermoregulatory system
How to control your body temperature
Homeostasis-maintaining a constant internal environment .
Body temp is controlled by the hypothalamus.
1.change in temp stimulates thermoreceptors and action potentials go to the hypothalamus via the sensory neurons
2.hypothalamus sends info via the motor neurons to the effectors.
3.the effector responds e.g shivering or sweating
Average temperature for different animals
Humans-36.1-37.2
Dogs-37.9-39.9
Pig-38.7-39.9
Chicken-40.6-43.0
Definition of osmoregulation
Physiological process that an organism uses to maintain water balance.
Osmoregulation
What happens when you have a high water content ?
You are hydrated
1.pituitary releases little ADH(anti-diuretic hormone).
2.low volume of water reabsorbed to your kidneys.
3.high volume of dilute urine to the bladder .
4.low volume of water into the blood.
Osmoregulation
What happens when you have a low water content ?
You become dehydrated
1.pituitary releases lots of ADH.
2.high volume of water reabsorbed by the kidneys
3.low volume of concentrated urine to the bladder.
4.high volume of water into the blood.
Circulatory disease
Von willerbrand disease
Caused by blood not clogging probably.
Type 1-least severe
Type 3-most severe
Symptoms
-excessive bleeds/unexplained bleeds
-blood in urine or faeces
No treatment-learn how to manage
Circulatory disorders
Heart murmurs
Caused by abnormal blood flow,from an abnormal heart structure.
Symptoms
-coughing
-weakness
-problems exercising
Treatment-depends on murmur some can be treated by change in diet or medication
Circulatory disorder
Mitral valve disease
Causes the mitral valve to degenerate meaning it doesn’t close properly,meaning back flow can happen-eventually it collapses causing heart failure
Symptoms
-heart murmur
-shortness of breath
-coughing
Treatment
-drugs to remove fluid
-low sodium diet
The integumentary system
Skin glands
Skin glands-different exocrine glands secrete different substances.
Sudoriferous-secrete sweat
Subaceous—secrete sebum-keeps hair and skin lubricated
Ceruminous-specialised sudoriferous glands which secrete ear wax
The integumentary system
Hair
Made of keratin
Downy hairs-dense,fine,soft hairs-close to skin-good insulators.
Guard hairs-thicker,longer hairs -make up top coat-prevent injury to the skin
Locomotion
Climbing
-apposable limbs
-caritanised nails/claws
-long limbs
Hopping/leaping-elastic tendons,long and powerful rear limbs
Gliding-extra skin,cartilaginous wrists
Running-missing bones,longer limbs
Powered flight-light beak,stream line feathers ,light bones
Swimming-long tail
How does the eye work ?(vision process)
1.light rays refract and focus on the pupil as they enter through the cornea
2.iris contracts/relaxes depending on how much light they want in
3.lens refracts light more -focuses on the retina
4.retina respond to light from photoreceptors which travel to the brain via the optic nerve
Photoreceptors in the eye
Rods:light sensitive and can function in the dark -single pigment called rhodopsin-only see in grey and not very well.
Cones:function at a higher intensity -allow species to see in colour-pigment called iodopsin-each cone responds to each colour
Adaptations of the eye in predators(carnivores
-binocular vision-each eye overlaps-creates a 3D image
-on the front of there face-narrow field vision
-focus-better depth perception
Adaptations of the eye in prey (herbivores)
-monocular vision-each eye works independently
-on the side of head-wider field vision
-poor depth perception
Integumentary system-FEATHERS
CONTOUR FEATHERS-fuzzy near the bottom to let air in -thick at the top to insulate and add shape.
DOWN FEATHERS-small and fluffy to add insulation
SEMIPLUME FEATHERS-insulate beneath contour feathers
FLIGHT FEATHERS-on wings-no gaps-push air down to keep the bird in the air.
BRISTLE FEATHERS-looks like a whisker-keeps dust out of nose and eyes.
Rachis-white stem in the middle of the feathers
FILOPLUME-between feathers-connected to nerve endings-send info about alignment.
The integumentary system-SKIN STRUCTURE
EPIDERMIS-waterproof outer layer-keeps pathogens out of the body-elastic and gives skin it’s colour.
DERMIS-middle layer which contains hair follicles,nerves,blood vessels and glands to regulate body temp.
SUBCUTANEOUS LAYER-bottom layer-made of connective tissue and has a high amount of fat for insulation and shape.
The integumentary system-NAILS,CLAWS AND HOOVES
NAILS-nail matrix forms on top of the dermis-root of the nail grows from a thick layer of matrix.
CLAWS AND HOOVES-made of a section of the dermis-covered in a layer of keratinised epithelium.
The integumentary system-HORNS AND ANTLERS
ANTLERS-made of bone and become more compact as they grow.
HORNS-cone of keratin which surrounds a mass of bone -rhinos don’t have the bone.
Skeletal disorders-HIP DYSPLASIA
SYMPTOMS:limping,pain in groin,loss of motion at the hips.
TREATMENT:surgery-if left untreated they will get arthritis.
Skeletal disorders-OSTEOCHONDRITIS
SYMPTOMS:pain,popping and locking,joint weakness
TREATMENT:therapy,stretching and exercises
Skeletal disorders-OSTEOARTHRITIS
SYMPTOMS:stiffness and lameness
TREATMENT:prescribed food
Specialised digestive systems-BIRD DIGESTION
1.uses tongue to push food back and swallow .
2.food moves down the oesophagus to the crop.
3.passes to the preventriculus-digestive enzymes and hydrochloric acid are added
4.food goes to the gizzard where it is mechanically digested
5.small and large intestine join there are two ceca.
6.water is reabsorbed and food is fermented
7.goes out the cloaca
Type of joints
FIBROUS-fibrous connective tissue allows no movement-joint is fixed.
CARTILAGINOUS-joints held together by cartilage allowing slight movement.
SYNOVIAL -joints that allow a wide range of movement e.g the ball and socket joint.
Teeth and mouth
INCISORS-fine nibbling and cutting and delicate grooming.
CANINES-holding prey and tearing meat
PREMOLARS-shearing flesh and grinding food.
MOLARS-shearing and grinding meat
Teeth and mouth-HERBIVORES
-Diastema helps move food around molars.
-incisors-used to cut plant material
-molars continuously grow-worn down by silica in plants.
Teeth and mouth-CARNIVORES
CANINES-hold prey and pierce and rip meat.
CARNASSIAL TEETH-shear meat
Teeth and mouth-OMNIVORES
INCISORS AND CANINES-cut meat
FLAT MOLARS-grind plant material
Maxillary-top teeth
Mandibular-bottom teeth
Skeletal attachments and functions
JOINT-the point at which bones meet allowing movement.
TENDON-attaches muscle to bone enabling movement.
LIGAMENT-connects bone to bone.
MUSCLE-function to produce force and motion.
CARTILAGE-maintains joint motion and cushions bone on impact.
Synovial joint structure
HYALINE CARTILAGE-reduces friction and is a shock absorber
LIGAMENT-bone to bone (blob)
TENDON-muscle to bone
SYNOVIAL MEMBRANE-produces synovial fluid.
SYNOVIAL FLUID-lubricates the joint and has nutrition for the hyaline cartilage.
FIBROUS JOINT CAPSULE-envelope around the synovial joint offering protection.
Structure and functions of bones
LONG BONE-longer than wide-act as levers-aid locomotion and support .
SHORT BONE-shape is equal dimensions-absorbs impact,e.g bones in feet or paws.
FLAT BONES-strong flat plates of bone-protect organs-muscles attach to them.
SESOMOID BONE-short irregular bones,embedded into tendons/reduce friction.
IRREGULAR BONES-odd shaped-protection,support,anchor point-e.g bones of the vertebral column.
Mono gastric digestion
1.food enters mouth-mechanically brocken down by teeth and tongue.
2.saliva is added to start chemical digestion.
3.food is swallowed and moved down the oesophagus to the stomach.
4.hydrochloric acid and enzymes are added to break food into chyme.
5.it enters the duodenum and bile emulsifies fat and neutralises stomach acid.
6.in the jejunum and ileum nutrients are absorbed and taken to cells to be stored.
7.large intestine-water is absorbed through villi.
8.waste stored in rectum until it leaves the body via the anus.
Nutrients groups
PROTEIN-growth and repair
CARBOHYDRATES-supply energy to cells
LIPIDS(FATS)-supply and store energy and insulate and cushion organs
VITAMINS-promote specific chemical reactions
MINERALS-growth and maintenance of bones and teeth
Fibre-increase bulk and water to regulate normal bowel function
WATER-50-70%of body -helps with chemical transport