Understanding Cholesterol and Protein for Better Health
Cholesterol
Cholesterol can be synthesized by the body, absorbed by the intestine, and causes excess cardiovascular problems.
HDL cholesterol collects in the arteries and transports it to the liver. Exercise and moderate alcohol consumption increase HDL, while smoking decreases it.
Functions of Cholesterol
- Synthesis of steroid hormones
- Synthesis of bile acids necessary for the absorption of fats
- Synthesis of vitamin D
- Formation of cell membranes
Protein
A protein is considered more complete the more amino
Body Composition, Energy Needs & Nutritional Health Factors
Body Mass Index (BMI)
Formula: BMI = Weight (kg) / Height (m)²
BMI Categories:
- 18.5 – 24.9: Normal weight
- 25.0 – 29.9: Overweight
- 30.0 – 39.9: Obese
- 40.0+: Very Obese (Morbidly Obese)
Waist Circumference & Health Risks
Measure around the smallest part of the waist.
Risk Thresholds (Waist Circumference):
- Men: Increased risk > 94 cm; High risk > 102 cm
- Women: Increased risk > 80 cm; High risk > 88 cm
Associated Health Risks:
- Diabetes (Type II)
- Non-communicable diseases (e.g., cardiovascular disease)
Autonomic Nervous System Divisions Compared
Somatic vs. Autonomic Nervous Systems
Somatic Nervous System (SNS)
- Single axonal pathway from CNS.
- Thick myelin fibers.
- Target organs: skeletal muscles.
- Effect of neurotransmitter: excitatory.
- Neurotransmitter at target site: always acetylcholine.
- No ganglia present.
Autonomic Nervous System (ANS)
- Preganglionic and ganglionic neurons.
- Effectors are glands and involuntary muscles.
- At least one ganglion located outside the CNS.
- Thin or unmyelinated fibers.
- Transmitted effect may be excitatory or inhibitory.
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Read MoreBiofuels, Polymers, and Sustainable Materials
Understanding Biofuels
Biofuel is any liquid fuel produced from vegetable raw materials whose chemical characteristics can replace gasoline and diesel.
Types of Biofuels
Biodiesel
Biodiesel is a liquid synthetic biofuel obtained from natural lipids such as vegetable oils or animal fats.
Biodiesel Applications
- Vehicles (e.g., rental cars, food transport trucks, farm machinery, commercial freight vessels like ferries, yachts, sailboats)
- Home heating oil
- Electricity generators (often a superior alternative
Key Diseases and Medical Advancements
Major Health Topics
Diabetes
Type 1 Diabetes
The pancreas does not produce insulin. Caused by the action of several inherited genes; possible autoimmune origin. Requires chronic insulin treatment. Involves many blood glucose injections (and urine analysis). Requires careful management of sugar intake.
Type 2 Diabetes
Affects adults, often associated with obesity and an unhealthy lifestyle. The pancreas produces little insulin, or the effect of insulin is greatly diminished (insulin resistance). Treatment
Read MoreKey Concepts in Biology
Characteristics of Living Organisms
- Living things have motion; they move. Plants move in order to catch sunlight for photosynthesis.
- Living things respire. Respiration is a chemical reaction which occurs inside cells to release energy from the food consumed.
- Living things are sensitive to stimuli and have the ability to sense changes in their environment.
- They grow. Living things mature and grow through different stages of development.
- They acquire and fulfill nutritional requirements to survive through