Question

question- Describe 3 properties of water and how they relate to the human body. need brief explan (2 pt for each term, 2 pt for biological relevance; [12 pt])

Answer 1

• water makes up 60-75% of human body weight.
• molecular make up of water is H2O
• i.e, 2 small positively charged hydrogen atom and one large negatively charged oxygen atom.

BIOLOGICAL RELEVANCE AND RELATION TO HUMAN BODY

1.Water is the Universal Solvent

• as per polar molecule water interacts best with the other polar molecules.
• ie,opposite charge attract one another.
• because each individual water molecule has both negative and a positive portion,each side is attracted to molecules of the opposite charge.
• this attraction allows water to form relatively strong connection called bonds,with other polar molecules around it,including other water molecules.
• In the case of water hydrogen atom bond with oxygen atom.
• This bonding makes water molecules stick together in a prop[erty called cohesion.
• The cohesion of water molecules help plants to take up water at their roots .
• Cohesion also contributes to Water's high boiling point,which helps animals regulate body temperature.
• water's extensive capability to dissolve a variety of molecules has earned it the designation of Universal solvent and it is this ability that makes watere such an invaluable life -sustaining Force.

​​​​​​​2.HELPS TO TRANSPORT OXYGEN AND NUTRIENTS.

• Water's role as a solvent helps cells transport and use substances like oxygen and nutrients,
• Water-based solutions like blood help carry molecules to the necessary locations.
• thus,water's role as a solvent facilitates the transport of molecules like oxygen for respiration and has a major impact on the ability of drugs to reach their targets in the body.

3.WATER SUPPORTS CELLULAR STRUCTURE

• ​​​​​​​Water fills cells to help maintain shape and structure.
• The water inside many cells creates pressure that oppposes external forces,similar to putting in ballon.
• water maintains the shape of cell and structure of the body.

​​​​​​​4.CHEMICAL REACTIONS OF WATER

• Water build and breakdown important components of cell.
• Example:Photosynthesis in plants
• Molecules like DNA and proteins are made up of repetitive units of smaller molecules.
• putting these small molecules together occurs through a reaction of water
• Also conversely, water is required for the reverse reaction that breaks down these molecules,allowing cells to obtain nutrients or repurpose pieces of big molecules.

​​​​​​​5.HIGH SPECIFIC HEAT AND COOLING POINT

• Specific heat is amount of heat absorbed or lost for 1gm to change 1degree celsius,which in the case of water,is pretty high
• This allows for evaporative cooling to occur,which is when heat energy is transferred to water molecules,and evaporating water to removes a lot of heat energy from an organism.(eg: when we SWEAT.