Warm-Up (3/4) Name Date Period Ants communicate with each other when a food source is discovered. When more ants arrive at the food source, the signal is amplified, and an exponentially higher number of ants comes to the food source. Scientists have hypothesized that the method of communication is by depositing pheromones (hormones which other ants can detect by scent). There are many chemically-purified versions of these pheromones available for laboratory use. Explain how you could test the pheromone hypothesis to answer the question of whether pheromone-driven positive feedback promotes ants to go to a food source.

4A.4a: Interactions between organs provide essential biological activities. Illustrative example: kidney and bladder 4A.4b: Interactions and coordination between systems provide essential biological activities. Illustrative example: respiratory and circulatory 4B.2a: Organisms have areas or compartments that perform a subset of functions related to energy and matter, and these parts contribute to the whole. 4B.2a.1: At the cellular level, the plasma membrane, the cytoplasm and, for eukaryotes, the organelles contribute to the overall specialization and functioning of the cell. 4B.2a.2: Within multicellular organisms, specialization of organs contributes to the overall functioning of the organism. Illustrative example: exchange of gases 4B.2a.3: Interactions among cells of a population of unicellular organisms can be similar to those of multicellular organisms, and these interactions lead to increased efficiency and utilization of energy and matter. Illustrative example: bacterial community around deep sea vents

Intra-organismal Interactions Interactions exist at the cellular and organismal levels. Cell membrane: regulates glucose transport Mitochondria: converts glucose to energy ATP

Intra-organismal Interactions Interactions exist at the cellular and organismal levels. Respiratory (lungs): exchanges gases (O2 and CO2) with air. Circulatory (blood): transports nutrients from digestion and gases from lungs.

Intra-organismal Interactions Interactions exist at the cellular and organismal levels. Kidney: filters blood and removes waste Bladder: takes waste from kidneys and expels it

Intra-organismal Interactions Unicellular bacterial communities can behave like multicellular organisms.

Critical Thinking Question #1 Create a model of a respiratory and circulatory system and show how the two systems interact.

Critical Thinking Question #2 If medical technology hypothetically existed to expand the size of a person’s lungs, predict the effects of this procedure on oxygen uptake in cells.

Closure On the piece of white paper from the back, answer the following question: Name Date Period Explain how analysis of a person’s urine could diagnose a problem with kidney function. Scale 1 – 10