Smaller mammals use proportionately more energy than larger...

Name: Problem 50, Chapter 11: College Physics: A Strategic Approach
Uploaded: 2021-03-13T03:02:37-08:00
Duration: 3 min 29 s
Channel: Khoobchandra Agrawal
Description: Smaller mammals use proportionately more energy than larger mammals; that is, it takes more energy per gram to power a mouse than a human. A typical mouse has a mass of 20 g and, at rest, needs to consume 3.0 Cal each day for basic body processes.

Smaller mammals use proportionately more energy than larger mammals; that is, it takes more energy per gram to power a mouse than a human. A typical mouse has a mass of 20 g and, at rest, needs to consume 3.0 Cal each day for basic body processes.

Key Concepts

Basal Metabolic Rate (BMR)

Basal metabolic rate refers to the amount of energy an organism requires to maintain basic physiological functions while at rest. It represents the minimum energy expenditure necessary for processes such as respiration, circulation, and cellular metabolism, and varies among species based on factors like body size, age, and temperature regulation needs.

Allometric Scaling

Allometric scaling is the study of how different biological characteristics, such as metabolic rate, change with the size of an organism. This concept explains that many physiological processes do not scale linearly with body mass, often following a power law relationship. It is used to understand why smaller animals, relative to their mass, may have higher metabolic rates compared to larger animals.

Surface Area to Volume Ratio

The surface area to volume ratio is a key concept that explains differences in metabolic rates between animals of different sizes. Smaller animals have a higher surface area relative to their volume, which can lead to greater heat loss. To compensate, they often exhibit higher metabolic rates to maintain homeostasis, thus consuming more energy per unit mass compared to larger animals.

Energy Metabolism

Energy metabolism encompasses the processes by which animals convert the food they ingest into energy needed for cellular processes and overall physiological function. This concept is fundamental in understanding how caloric intake is related to body mass and the energetic demands required to sustain life at various levels of activity or rest.

Please give Ace some feedback