Answer: A closed circulatory system and an excretory system consisting of tubular nephridia
Explanation:
<h3>Answer:</h3>
<em>LETTER </em><em>C</em>
Explanation:
MAKE ME BRAINLIEST AND FOLLOW ME
Answer: living things such as “human beings”, “animals”, “plants”, and “microorganisms”.. Nonliving things do no exhibit any characteristics
Explanation: Nonliving things do not grow,respire, need energy, move, reproduce, evolve, or maintain homeostasis. They are made up of non living materials
Answer:
mostly hydrophobic
Explanation:
A membrane is made of amphipathic molecules with the hydrophobic part pointing to the lumen and cytosol and the hydrophobic part (much bigger makes up most of the membrane) in the middle, the protein chains that are embedded in the membrane are thus mostly hydrophobic because the membrane is mostly hydrophobic and like likes like
Answer:
The barrier functions to regulate the chemical composition of the extracellular fluid surrounding the brain cells.
Explanation:
Blood-brain barrier
It is a very selective semipermeable membrane , hence allow some specific substance to pass via it . This barrier separates the extracellular fluid in the central nervous system and the circulating blood from the brain .
<u>The barrier is composed of the endothelial cells .</u>
Passive diffusion is shown in this system , and allows molecules like the water , glucose , amino acid to pass .
It regulates the chemical composition of the fluid of brain cell .
