Answer:
Nucleic Acids and proteins. (A, D)
Explanation:
Viruses are known as the typical parasites in the living environment, they are not plants, animals, or bacteria. All viruses have nucleic acid, either Deoxyribonucleic acid or Ribonucleic acid as their genetic material, but not both, and consisting of a protein coat, which helps to surround the nucleic acid (DNA, and RNA).
The basic viruses have only enough RNA or DNA to encode 4 proteins. They are generally classified by the species they infect such as plants, bacteria, or animals. Mostly they are two types in shapes: rods, or filaments, and spheres.
Answer:
D. WBC count
Explanation:
First, let's define symptom and sign.
A <u>symptom</u> is some sort of evidence that could suggest a disease or disorder, but it must be observed and noticed by the patient. Basically, it's what the patient feels.
So, a headache, pain, and nausea are all symptoms.
A <u>sign </u>is evidence that someone else observes or collects. So, a family member or doctor sees signs.
Therefore, temperature, white blood cell count, and pulse are all signs.
The question asks us which is a sign, not a symptom. Therefore, the best choice is D. WBC count
Muscles move bones by contracting and relaxing the muscle cells, which are connected to tendons. Tendons are a fibrous connective tissue that connects bone to muscle, so it is part of the process of muscle-bone movement. Muscle fibers contract, which shortens the muscle and uses the tendon to move the bone, the same goes for relaxing the muscle.
Answer:
The correct answer is A.
Explanation:
For a <u>young, healthy person, weighing 70kg,</u> resting cardiac output is approximately 5 liters per minute (assuming a heart rate of 70 bpm)
70ml stroke volume x 70 beats per minute = 5 liters/min
Stroke volume is the amount of blood ejected by the left ventricle with each contraction (normal value 70ml)
Answer: This is TRUE for me. Osteoporosis is a preventable disease.
Explanation:
In this condition, bone density ( the amount of bone tissue) is reduced because it's deposition does not keep pace with resorption. Although the bone is adequately mineralised, it is fragile and microscopically abnormal, with loss of internal structure.
Peak bone mass occurs around 35 years and then gradually declines in both sexes. Lowered oestrogen levels after the menopause are associated with a period of accelerated bone loss in women. Thereafter bone density in women is less than in men for any given age. That is why in North America, one-third of all women experience fractures because of this disease, amounting to about 2 million bone fractures per year.
Common features of osteoporosis are:
--> skeletal deformity: gradual loss of height with age, caused by compression of vertebrae.
--> bone pain
--> fractures: especially of the hip ( neck of femur), wrist and vertebrae.
It is TRUE for me that some risk factors can't be changed ( which is the low oestrogen levels that occur after menopause in women) but others, such as poor calcium intake, can.
Exercise and Calcium intake during childhood and adolescence are important in determining eventual bone mass of an individual and in preventing risk of osteoporosis in later life.
