Answer:
8 minutes and 20 seconds
Explanation:
photons emitted from the surface of the Sun need to travel across the vacuum of space to reach our eyes.
The integumentary, immune lymph and endocrine system protects us from infectious microorganisms which is different from the the way your nervous, skeletal, and muscle systems does.
<h3>What are the protective systems of the body?</h3>
The protective systems of the body are those body system that helps protect the body against disease causing microorganisms. They include the following:
- Nervous: This system helps establish a network of communication between the various cells of the body.
- Skeletal: This system provides support through the bones for movement.
- Muscle systems: This system protects the vital organs of the body by absorbing shock and reducing friction in the joints.
There are other systems the protects the body which include:
- The integumentary system: This serves as a protective layer for the whole body.
- Immune system: This is made up of immune cells that help fight foreign bodies.
- Lymph: This is contains lymphocytes that fights disease causing microorganisms.
- Endocrine system: this contains hormones that control almost all body process.
Learn more about immune system here:
brainly.com/question/15975169
#SPJ1
The neurotransmitter that is responsible for the voluntary movement of muscles in the arm is ACETYLCHOLINE.
Acetylcholine is the neurotransmitter that act at neuromuscular junctions, that is, it is released by the nervous system to activate muscle movement. Muscular contraction is usually initiated by the release of acetylcholine by the nervous system.
The Uneven heating creates hot and cold areas
Vacuole is a storage place for a cell and nucleus is the "brain" of a cell
