Answer:Small hydrophobic molecules and gases like oxygen and carbon dioxide cross membranes rapidly. Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly.Semipermeable membranes, also termed selectively permeable membranes or partially permeable membranes, allow certain molecules or ions to pass through by diffusion.
Explanation: hope that helps
Answer:
ANS - Autonomic Nervous system.
Explanation:
Autonomic nervous system (ANS) is responsible for regulating the involuntary control of smooth, heart muscles and some glands and organs.
Whereas the somatic nervous system (SNS) regulates the voluntary contraction of the skeletal muscles.
Answer:
D
Explanation:
proteins make up every thing
The cell membrane consists of three classes of amphipathic lipids: phospholipids, glycolipids, and sterols. The amount of each depends upon the type of cell, but in the majority of cases phospholipids are the most abundant, often contributing for over 50% of all lipids in plasma membranes.