Osmoregulation: Management of Water and Solute Composition in Animals

This presentation explains the concept of osmoregulation, which involves managing the content of water and solutes in an animal's body. It covers the components of osmoregulation, including semi-permeable cell membranes, solvents, solutes, and solutions. The presentation also discusses the importance and impacts of osmoregulation, as well as the simplified body plan and transportation epithelium. Additionally, it explains the process of osmosis and the role of polarized epithelial cells in osmoregulation. References are included for further reading.

Key concepts
Animal’s nitrogenous wastes usually reflect on its phylogeny and
habitat
The diverse excretory systems are variations to the tubular theme
The Nephrons and the associated blood vessels which are functional
units to the mammalian kidney (Bentley, 2013).
The ability of the mammalian kidney to conserving water is key
terrestrial adaptation
The diverse adaptations to the vertebrate kidney has been able to
evolve in numerous environments
Components of
Osmoregulation
Semi-permeable cell
membrane
Solvents
Solutes
Solutions
Osmoregulation
Management of the content of water in the
body as well as solute composition
Control the movements of solutes between
the internal fluids and the external
environment (Bentley, 2013).
It involves osmosis
Example of regulator
osmoregulation
There is a balance
of the uptake and loss
of water and solutes
(Bentley, 2013).
There is a
controlled movement
of the solutes which is
between internal
fluids as well as
environment
Osmoconformers
These are the marine animals’ isoomotic with the environment
Osmoregulator
Freshwater, marine, as well as terrestrial animals which are able
to adjust internal osmolarity (Bradley, 2009).
Impacts of Osmoregulation
It impacts internal PH, metabolite
concentration, waste management
It influences composition to the internal body
fluid such as hemolymph and interstitial fluid
It maintains on the cytoplasmic composition
in the cells (Bradley, 2009).
Simplified body plan
Body fluids and the compartments’
Transportation Epithelium
This is the layers of the cells in which are able to regulate on the
solute movement (Chiras, 2005).
They control on the movement of various solutes in controlled
amounts in a given direction
Epithelial cells are usually joined by junctions that are tight which
form an impermeable barrier which is between the internal cells and the
environment.
The Apical membrane: it encounters the lumen of
the body cavity (Chiras, 2005).
Basolateral membrane: It faces the interstitial fluid
Basement membrane: it anchors on the basolateral
membrane as well as support on the epithelial layer
Importance of Osmoregulation
It helps to maintain pressure in and out of the cells
It helps in maintaining on the water levels and this is what
would determine on the pressure (Chiras, 2005).
This is achieved in a slightly counter intuitive manner the
cell do not expel excess water, rather they would bring more
salts or sugar and this would raise on the osmolality in the
cell.

Osmosis
It is the movement of the water across
permeable membrane that is selective
It usually occurs whenever there are two solution
which are separated by a membrane and they differ
in terms of the osmotic pressure
Polarized epithelial cells
The transport across the cell has been possible
since the membrane is on one side which
transport systems which is much different from
the other side
This shows that epithelial cells are polarized
Feedback of osmoregulation
Osmoregulation has been a negative feedback
system. it is regarded as negative feedback system
control since it responds to the events which could
underlie on the conditions alternative from the set.
It is crucial to note that the negative feedback
usually entails on the cycle to the events which are
normally continuous (Chiras, 2005)..
Metabolic waste
The major waste products are
nitrogenous waste (Chiras, 2005).
There is breakdown of the protein and
the nucleic acid
The wastes are converted to ammonia,
Uric acid or Urea (Chiras, 2005).
References
Bentley, P. (2013). Endocrines and Osmoregulation: A Comparative Account in
Vertebrates. Berlin: Springer Science & Business Media.
Bradley, T. J. (2009). Animal Osmoregulation. Oxford: Oxford University Press.
Chiras, D. D. (2005). Human Biology. Burlington: Jones & Bartlett Learning.