Lecture 3: Homeorhesis Flashcards Preview

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Flashcards in Lecture 3: Homeorhesis Deck (11):


The orchestrated/co-ordinated control in metabolism of body tissues necessary to support a physiological state


Give some examples of Homeorhesis

Pregnancy, lactation and growth


Describe what happens during pregnancy in regards to homeorhesis

Fat and glycogen is accumulated, direction of essential nutrients goes away from bone, muscle, tissue etc. and to the uterus.


What happens to support changes during pregnancy?

Blood flow to the growing tissues and vital maternal organs are increased


Why are essential nutrients directed away from muscle, bone and tissue during pregnancy?

To ensure the growth of the baby, the pregnant uterus and development of mammary glands


Is homeorhesis fast-acting?

No. it operates over longer periods of time


Name the system that is best suited for major homeorhetic control factors and why?

The endocrine system: hormones. It is well suited to regulating long-term changes


Explain what happens to the dam's metabolism during pregnancy/lactation

Mammary glands demand a high amount of energy. The metabolism must be completely altered to provide requirements for milk synthesis.


Describe/explain the elephant seal during pregnancy and lactation

The mum nurses the 27kg pup, she doesnt eat/drink and loses 8kg a day while the pup gains 4kg a day. The dam then mates and goes to sea to feed again


Describe the result of diurnal changes

Diurnal changes result in circadian rhythms in metabolic rate, body temperature, mental activity, heart rate and blood pressure


What do these rhythms allow an organism to do?

Perform necessary functions the most effectively at appropriate times