Late adulthood or the old age is considered to start at age 65. According to Erik Erickson at this time it is important to find meaning as well as satisfaction. Theorists believe that activities that were started when they were young would be maintained as possible thus need to have proper diet and exercise.
Answer:
b. a semi-permeable double layer of phospholipids that have hydrophilic heads and hydrophobic tails
Explanation:
B is correct as the cell membrane is selectively semi-permeable. It is selectively semi-permeable because this quality allows it to control what can and can't enter the cell, and how it does so.
The cell membrane also has a phospholipid bi-layer comprised of a double layer of phospholipids which have hydrophilic head and hydrophobic tails. This is because the heads are made of phosphate and are polar and are therefore attracted to water (hydrophilic), while the tails are made of lipids (i.e. fats, oils) which do not mix with water and are therefore hydrophobic.
The properties of each phospholipid is also why they form the double layer structure, the hydrophilic heads naturally face outwards into the water and protect the hydrophobic tails on the inside.
Hope this helped!
These components include;
Cardiorespiratory Endurance: Ability of the circulatory and respiratory systems to supply oxygen during sustained physical activity.
Guidelines
3 - 5 days per week
20-60 minutes a day
intensity of 60%-90% of MHR
Muscular strength; the ability to perform activities that require high levels of muscular force.
2 -3 days per week
2-6 sets
≤ 6 repetitions
Intensity of 80 - 90 % of 1RM
Muscular endurance;
2 - 3 days per week
2 - 3 sets
≥ 12 repetitions
Intensity of 60% - 70% of 1RM
Flexibility
2- 3 days a week
≥ 4 repetitions per muscle group
15 - 60 seconds
Body composition Women men
Essential fat 10-13% 2-5 %
Athletes 14-20% 6-13 %
Fitness 21-24% 14-17 %
Average 25-31% 18-24%
Obese ≥ 32% ≥ 25%
I'm pretty sure that its the 3rd answer
