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LS1: From Molecules to Organisms (The Human Body and Homeostasis)

5 dot points across 5 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do feedback mechanisms keep an organism's internal conditions stable?

Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis in an organism (Louisiana Student Standards for Science, High School Biology, HS-LS1-3).
A standard-level answer on homeostasis for Louisiana LEAP 2025 Biology: what homeostasis is, the parts of a feedback loop, negative versus positive feedback, and examples such as temperature and blood glucose regulation.
13 min answer →

How are cells organized into the systems that carry out an organism's functions?

Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms (Louisiana Student Standards for Science, High School Biology, HS-LS1-2).
A standard-level answer on body organization for Louisiana LEAP 2025 Biology: the hierarchy from cells to organism, the major organ systems and their functions, and how systems interact to keep the organism alive.
12 min answer →

How does the immune system defend the body against disease?

Construct an explanation for how the immune system defends the body against pathogens and how vaccines provide immunity (Louisiana Student Standards for Science, High School Biology, HS-LS1).
A standard-level answer on the immune system for Louisiana LEAP 2025 Biology: pathogens and disease, the body's barriers and white blood cells, antibodies and immunity, and how vaccines protect against disease.
12 min answer →

How do the nervous and endocrine systems coordinate the body and maintain homeostasis?

Develop and use a model to explain how the nervous and endocrine systems coordinate body functions and contribute to homeostasis (Louisiana Student Standards for Science, High School Biology, HS-LS1-2 and HS-LS1-3).
A standard-level answer on coordination for Louisiana LEAP 2025 Biology: how the nervous system signals rapidly with neurons, how the endocrine system uses hormones, and how the two systems compare and maintain homeostasis.
12 min answer →

How do the circulatory and respiratory systems transport materials and exchange gases?

Develop and use a model to explain how the circulatory and respiratory systems transport substances and exchange gases to support cells (Louisiana Student Standards for Science, High School Biology, HS-LS1-2).
A standard-level answer on transport for Louisiana LEAP 2025 Biology: the circulatory system and blood, the respiratory system and gas exchange, how oxygen and carbon dioxide move by diffusion, and how the two systems support cells.
12 min answer →