15940081
Description
Flashcards by Ellie Potellie, updated more than 1 year ago
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Created by Ellie Potellie
about 6 years ago
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| Question | Answer |
| What Affects An Organisms Ability To Maintain Its Metabolic Rate? | External Factors, abiotic factors |
| What Are Abiotic Factors | Non-living |
| List Abiotic Factors | •Temperature •PH •Oxygen Concentration •Salinity (Saltiness) |
| How Do Regulators Achieve Maintaince? | Through Homoeostasis |
| What Is Homoeostasis | Homoeostasis is a process where a change from the normal is detected by receptors & effectors correct this change |
| What Does It Cost? | Energy, therefore high metabolic cost |
| What Is The Optimum Condition In The Body Referred To? | Set point |
| What Causes Negative Feedback To Engage? | When conditions deviate, negative feedback is engaged to return the condition back to set point |
| How Is Change Detected? | Change is detected by receptors |
| What Signal Is Sent To Effectors? | Nerves/Hormones |
| What Do Effectors Do? | Effectors bring about the connective response |
| Where Are Thermoreceptors Found? | In the hypothalamus |
| What Do Thermoreceptors Do? | Detect the internal temperature of the body |
| What Is The Set Point For The Human Body? | 37*C |
| What Happens When There Is An Increase In Body Temperature? | Receptors in hypothalamus detect an increase, |
| What Do The Receptors Do? | A nervous signal is set to the skin (Effector) |
| What Does The Skin Do In Response To The Increase In Temperature? | There is an increase in sweat production from glands The evaporation of sweat cools the body |
| What Is Vasodilation? | Vasodilation is when blood vessels in the skin dilate, bringing blood closer to the surface |
| How Is Heat Lost? | Heat is lost by radiation |
| How Does This Response Affect The Metabolic Rate? | It Decreases the metabolic rate |
| What Happens When There Is An Decrease In Body Temperature? | Receptors in hypothalamus detect an decrease, |
| What Do The Receptors Do? | Nerve signal is sent to skin |
| What Does The Skin Do In Response To The Decrease In Temperature? | Piloerection (Goosebumps) |
| What Do Piloerection (Goosebumps) Do? | Hair-erector muscles contract causing hair to rise & trap an insulating layer of air around the body |
| What Is Vasoconstriction? | Vasoconstriction is when blood vessels in the skin narrow and move blood from the surface reducing heat loss |
| What Are Shivers? | Shivers are rapid contraction of skeletal muscle that results in heat generation by friction |
| How Does This Response Affect The Metabolic Rate? | This cause an increase in metabolic rate? |
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