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The smaller branches that flow into the main branch are called tributaries.
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bronchioles
Alveoli
Pruners are the smaller single handed tool for pruning smaller branches. Shears are a two handed tool for shaping hedges. Another name for pruners is secateurs. Long-handled pruning tools for branches are called loppers.
Vein
A smaller river which joins a larger one is called a tributary. If a river branches and later these branches re-connect - as in flowing around around an island - the smaller branch is sometimes called an arm. If the branching occurs near the sea, and the arms don't reconnect, then the arms are referred to as a delta.i like chicken
The Lungs
Typically, the smaller units comprising a system are called subsystems or components, and the larger unit enclosing a system is called a suprasystem or environment.Example: The targeted suprasystem of a family may be the church community or ethnic group to which it belongs.A supra system is the larger unit comprises smaller units. For example a university has different branches like Arts, science, computers, maths etc., each of these branches can be observed as a smaller unit which functions independently.
Structure of the tracheaThe trachea is lined by cartilage and divided into two branches. These two branches are called the bronchi. The left bronchus enters the left lung and the right bronchus enters the right lung. Each bronchus is further divided into around 25 smaller branches. These smaller divisions of bronchi are known as the bronchioles. The bronchioles carry air into the alveoli.
Peeping twigs
Capillaries are just smaller continuations/branches of arteries.