The normal pulse rate for humans is usually 60 to 100 beats per minute, however, there are certain medical conditions such as cardiac arrhythmia which may alter the normal pulse rate of an individual. Other influencing factors include your age, gender and fitness level.
Aldosterone is a hormone secreted by the adrenal cortex, and insulin is a peptide secreted by the pancreas. When aldosterone contacts a target cell, it binds to an intracellular receptor and migrates to the nucleus; insulin binds to extracellular receptors on the plasma membrane. What is the most likely reason for this difference? a. Aldosterone is hydrophilic and therefore must enter the aqueous environment of the cytoplasm to have an effect. b. Aldosterone is lipid-soluble and therefore easily crosses the phospholipid bilayer of the plasma membrane.
Hydrophilic molecules (and portions of molecules) can be contrasted with hydrophobic molecules (and portions of molecules). In some cases, both hydrophilic and hydrophobic properties occur in a single molecule. An example of these amphiphilic molecules is the lipids that comprise the cell membrane.nother example is soap, which has a hydrophilic head and a hydrophobic tail, allowing it to dissolve in both water and oil. Hydrophilic and hydrophobic molecules are also known as polar molecules and nonpolar molecules, respectively.