Homeostasis & thermoregulation

Homeostasis in the human body is often maintained by a: 

• neutral feedback loop 
• solar feedback loop
• positive feedback loop
• negative feedback loop

Tags

NGSS.HS-LS1-3

Homeostasis

• allows for a wildly fluctuating internal environment
• is impossible in vertebrates
• is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation
• is the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation

Tags

NGSS.HS-LS1-3

Salt water crocodiles bask in the sun for several hours every morning. which one of the following statements best describes the method of thermoregulation in salt water crocodiles?

• Endothermy, increase body temperature to increase rate of metabolism reactions in cells

• Ectothermy, decrease body temperature to increase rate of metabolic reactions in cells.

• Endothermy, decrease body temperature to increase rate of metabolic reactions in cells

• Ectothermy, increase body temperature to increase rate of metabolic reactions in cells

Tags

NGSS.HS-LS1-3

The graph above shows changes in body temperature of an endotherm with time.

Which one of the following accurately describes the regulatory mechanism shown in the graph?

• A - Negative feedback

• B - Positive feedback

• C - Thermoregulation

• Both A and C

Tags

NGSS.HS-LS1-3

Which best describes the stimulus-response model?

• Stimulus -> receptor -> effector -> control center -> response

• Stimulus -> receptor -> control centre -> effector -> response

• Stimulus -> effector -> control center -> receptor -> response

Tags

NGSS.MS-LS1-8

What is the role of Neurotransmitters?

• Chemical signals that pass nerve signals on to the next neuron

• Electrical signals that pass nerve signals on to the next neuron

• Hormone signals that pass nerve signals on to the next neuron

• Receptors that pass nerve signals on to the next neuron

Homeostatic cooling mechanisms include

• piloerection and panting

• panting and vasoconstriction

• sweating and piloerection

• sweating and vasodilation

Tags

NGSS.HS-LS1-3

Why does pulse rate increase during exercise?

• Oxygen and carbon dioxide must be removed from the body ASAP

• Gas exchange must happen more quickly than when a person is at rest

• Oxygen must be moved to the lungs and carbon dioxide must be moved to cells more quickly

• Carbon dioxide must be moved to the kidneys to be excreted

Tags

NGSS.HS-LS1-3

If a person's blood cells shrivel (shrink) their blood is likely

• isotonic

• hypotonic

• hypertonic

Tags

NGSS.HS-LS1-3

temperature regulation center in the brain of a human

• hypothalamus

• thermoregulation

• receptor

• negative feedback

Tags

NGSS.HS-LS1-3