The endocrine system. Major Endocrine Glands What is a target cell? 15.1 Endocrine glands.
1. Review How do the immune systems and endocrine glands help to maintain homeostasis 2. Apply...
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Transcript of 1. Review How do the immune systems and endocrine glands help to maintain homeostasis 2. Apply...
1. Review How do the immune systems and endocrine glands help to maintain homeostasis
2. Apply Concepts Describe how the circulatory and endocrine systems of migrating wildebeest help maintain homeostasis
3. Review Define ectoderm and endotherm
Digestive, respiratory, circulatory, excretory, nervous, muscular, and skeletal systems are all interconnected and work together to maintain homeostasis.
Body Temperature Control
Requires three components: Source of heat Way to conserve heat when necessary Method of eliminating excess heat when necessary.
Ectotherms
Regulate body temperature primarily by absorbing heat from, or losing heat to, their environment
Most reptiles, invertebrates, fishes, and amphibians.
Relatively low metabolic rates when resting- don’t generate much heat
Lack effective body insulation so body heat is easily lost
Warm up by basking in the sun and often use underground burrows.
Endotherms
Regulate body temperature, at least in part, by using heat generated by its body
Birds and mammals High metabolic rates that generate heat, even
when they are resting Conserve body heat primarily with insulating
feathers, fat, fur, or hair Reduce body temperature by sweating and
panting.
Ectotherms need much less food than similar-size endotherms need
Ectothermy is a more energy-efficient strategy in consistently warm environments
Large ectotherms have trouble in cold temperatures trying to warm up.