22 results for “blood”
The Human Body
The Heart and Blood
blood moving, and the blood's job is to keep everything else alive. The pump The heart
Article · 4 min read
The Human Body
The Skeleton and Bones
blood cells to carry oxygen, white blood cells to fight infection, platelets to clot wounds. Bone
Article · 5 min read
Animals
Mammals
blood unite a group that ranges from a 2-gram bat to a 150-tonne whale
Article · 4 min read
Animals
Reptiles and Amphibians
blooded animals have solved life's problems in their own way. Long before there were mammals
Article · 3 min read
The Human Body
Lungs and Breathing
blood. Here is how breathing works. You have done it about 20,000 times today without
Article · 4 min read
The Human Body
Muscles
blood and push your food along. Every one of them works the same way: by pulling
Article · 4 min read
The Human Body
Skin, Hair and Nails
blood vessels in the dermis widen so more warm blood flows near the surface and gives
Article · 3 min read
The Human Body
The Brain
blood vessels. It cannot store fuel, so a few minutes without blood flow causes permanent damage
Article · 4 min read
Animals
The Octopus
blood through the gills and one through the body. Its blood is blue, because it carries
Article · 3 min read
The Human Body
The Immune System
blood vessels leak, flooding the area with fluid and white cells, which is why a wound
Article · 4 min read
The Human Body
Digestion
blood. Digestion is the process of taking them apart into small pieces, sugars, amino acids and fatty
Article · 4 min read
Chemistry
Acids and Bases
blood must stay between pH 7.35 and 7.45. Chemicals called buffers soak up extra acid or base
Article · 3 min read
The Human Body
The Senses
blood pressure; others in the brain monitor temperature and the chemistry of the blood, producing thirst
Article · 4 min read
Life & Biology
What Is Life? The Cell
blood cells that ferry oxygen, skin cells that form a barrier. All of them descended from
Article · 4 min read
Life & Biology
Dinosaurs and Mass Extinctions
blooded, or something close to it. A great many had feathers, which evolved first for insulation
Article · 3 min read
Matter, Energy & Physics
The Periodic Table
blood are star material. The elements beyond uranium, number 92, do not survive in nature. They
Article · 4 min read
Animals
Whales and Dolphins
blooded, insulated by a thick layer of fat called blubber rather than fur. They give birth
Article · 4 min read
Planets & the Solar System
Mars
blood. Through telescopes it showed polar caps that grew and shrank with the seasons and dark
Article · 4 min read
Chemistry
The Chemistry of Life
blood; antibodies fight infection; keratin makes hair and nails; collagen holds skin and bones together; and the proteins
Article · 3 min read
Chemistry
Water: The Strangest Ordinary Substance
blood can carry nutrients, and why almost every chemical reaction inside a living cell happens in water
Article · 3 min read
Animals
Sharks
blood at concentrations of a few parts per billion, and their nostrils are so sensitive to timing
Article · 3 min read
Space & the Universe
The Life of a Star
blood, was built inside stars and scattered by their deaths. The cloud that collapsed to form
Article · 3 min read
