RESPIRATORY SYSTEM: Renews 80% of its air in one breath Oxygen reserves in the blood & muscles Hemoglobin Myoglobin Diving at great depths
CIRCULATORY SYSTEM: Warm blooded Veins/Arteries Also used to conserve body heat Abundant with red blood cells Increases amount of oxygen carried
HEART: Heart rate about 60bpm at the surface Heart rate about 30bpm when diving Large whales it is a lot slower: 10-30bpm After a lengthy time under water, the right half of the heart stops beating and restricts blood flow to the lungs to allow the left side of the heart to send the oxygenated blood to the brain
THERMOREGULATION: Thick layer of blubber just underneath the skin Insulation & energy reserve Body temp. about 97.5 F Blubber composed of fat cells & fibrous connective tissue about 3-4 in. thick Increased metabolic rate generates body heat When diving blood is shut off from the surface to decrease circulation to conserve body heat Warm water/Exercise may cause the need to release excess heat to the flippers, flukes, or fins Their reduced limb sizes and body shape help them conserve body heat because of the decreased amount of surface area exposed
MUSCULAR SYSTEM: Great amounts of myoglobin rich in oxygen Tail is main source of forward movement Dorsal Fin source for rolling or changing position in water Flukes are used for steering and to aid in stopping Main source for oxygen storage
SKIN: Epidermis Stratum granulosum Stratum lucidum Shed rapidly while swimming Mitotic division rate about 290X that of the human epidermis
SENSES: Sight Hearing/Echolocation Sends out a sound that echoes of the object to determine the distance, size, shape, texture, and speed of the object Send to the brain through the auditory nerve Smell Taste Touch vibrissae/stubble-like whiskers Magnetism
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