2.e.2 regulation timing and coordination of physiological events are regulated by multiple...

2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms.

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2.E.2 Regulation

Timing and coordination of physiological events are regulated by

multiple mechanisms.

In plants, physiological events involve interactions between environmental

stimuli and internal molecular signals.

Page 3: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Phototropism is a response to the presence of light.

Page 4: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Growth toward light is due to the plant hormone auxin. Auxin collects on the side of the stem away from the light

source and stimulates differential cell elongation.

Page 5: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Photoperiodism, which results in flowering in long-day and short-day plants, is regulated by critical night

length.

Page 6: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

In animals, internal and external signals regulate a variety of physiological responses that synchronize with environmental cycles and cues.

Page 7: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Example: Circadian rhythms, or the physiological cycle of about 24 hours that is present in all eukaryotes and is endogenous,

persisting even in the absence of external cues.

The sleep movements of the bean plant continue even if the plant is placed in constant darkness.

Page 8: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Example: Diurnal/nocturnal and sleep/awake cycles

Page 9: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Example: Jet lag in humans results from alterations to the body's circadian

rhythms.

Page 10: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Example: Seasonal responses, such as hibernation, estivation and migration.

Page 11: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Example: Release and reaction to pheromones

Page 12: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Example: Visual displays in the reproductive cycle

Page 13: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

In fungi, protists and bacteria, internal and external signals regulate a variety of physiological responses that synchronize

with environmental cycles and cues.

Page 14: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Example: Fruiting body formation in fungi, slime molds and certain types of bacteria is regulated by environmental cues such as nutrients, temperature,

light and humidity.

Page 15: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Example: Many species of bacteria use quorum sensing to coordinate gene

expression according to the density of their local population.

Page 16: 2.E.2 Regulation Timing and coordination of physiological events are regulated by multiple mechanisms

Learning Objectives:

• LO 2.35 The student is able to design a plan for collecting data to support the scientific claim that the timing and coordination of physiological events involve regulation. [See SP 4.2]

LO 2.36 The student is able to justify scientific claims with evidence to show how timing and coordination of physiological events involve regulation. [See SP 6.1]

LO 2.37 The student is able to connect concepts that describe mechanisms that regulate the timing and coordination of physiological events. [See SP 7.2]

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