The correct answer is: b. conscious neural control
Neural control of digestive tract is unconscious achieved via the autonomic nervous system.
Local nervous system of the digestive system is called the enteric or intrinsic nervous system. The major components of this nervous system are two networks or plexuses of neurons:
• The myenteric plexus – controls digestive tract motility
• The submucous plexus - regulates gastrointestinal blood flow and controls epithelial cell function.
The four main classes of organic compounds (carbohydrates,
lipids, proteins, and nucleic acids) that are essential to the proper
functioning of all living things are known as polymers or
macromolecules. All of these compounds are built primarily of carbon,
hydrogen, and oxygen but in different ratios. This gives each
compound different properties.
Carbohydrates are used by the body for energy and structural
support in cell walls of plants and exoskeletons of insects and
crustaceans. They are made of smaller subunits called
nionosaccharides. Monosaccharides have carbon, hydrogen, and oxygen
in a 1:2:1 ratio. Monosaccharides or simple sugars include glucose,
galactose, and fructose. Although their chemical formulas are the
same, they have different structural formulas. These simple sugars
combine to make disaccharides (double sugars like sucrose) and
polysaccharides (long chains like cellulose, chitin, and glycogen). Color
code the glucose molecule on this worksheet (carbon-black, hydrogenyellow,
and oxygen-red). Use your textbook to help draw the
structural formulas for fructose and galactose:
HeterotrophA heterotroph is an organism that ingests or absorbs organic carbon in order to be able to produce energy and synthesize compounds to maintain its life
All the options are correct.
1. New ways to preserve and transport blood for blood transfusions were discovered.
2. Blood transfusion safety was improved.
3. Scientists discovered that elements of blood could be separated by centrifuge.
4. Scientists discovered that plasma could be preserved by freezing.
Karl Landsteiner
Karl Landsteiner was the man who discovered some of the human blood types in 1900 and 1901 at the University of Vienna.
