Science & Technology Fundamentals

The adult human skeleton has 206 bones. Infants are born with around 270-300 bones, but many fuse together during growth (especially in the skull, spine, and pelvis). The final count of 206 is standard in human anatomy.

The pancreas functions as both an endocrine and exocrine gland. Its endocrine function secretes insulin (which lowers blood sugar) and glucagon (which raises blood sugar). The exocrine function produces digestive enzymes, not bile.

The tibia (shinbone) is the larger of the two bones in the lower leg, connecting the knee to the ankle. It bears most of the body's weight. The fibula is the smaller bone alongside it.

The cerebrum is the largest part of the human brain, making up about 85% of brain weight. It handles thinking, reasoning, memory, language, and voluntary movements. The cerebellum coordinates movement, and the medulla controls vital functions like breathing.

Calcium phosphate (specifically hydroxyapatite, Ca₁₀(PO₄)₆(OH)₂) is the main mineral component of bones and teeth, giving them hardness and strength. It makes up about 65-70% of bone tissue.

Hemoglobin contains four iron atoms (in heme groups), each binding one oxygen molecule. Iron is essential for oxygen transport: without it, hemoglobin cannot function. This is why iron deficiency causes anemia.

Men CAN develop breast cancer, though it's rare (about 1% of all breast cancers). Men have breast tissue and can develop breast cancer due to genetics, age, obesity, or radiation exposure. The myth that only women get breast cancer is dangerous because it delays diagnosis in men.

Hair loss during chemotherapy depends on the specific drugs used, dosage, and individual factors. Some chemotherapy drugs cause complete hair loss, others cause thinning, and some don't affect hair at all. Modern targeted therapies and immunotherapies often don't cause hair loss.

While a positive attitude may improve quality of life and help patients cope with treatment, it cannot cure cancer. Cancer requires medical treatment like surgery, chemotherapy, radiation, or immunotherapy. The myth that attitude alone can cure cancer is harmful because it can guilt patients who don't recover.

Smoking cigars DOES cause lung cancer, as well as mouth, throat, and esophageal cancers. Even if cigar smokers don't inhale as deeply as cigarette smokers, they still absorb carcinogens through saliva and oral mucosa. Cigar smoke contains the same toxic and cancer-causing chemicals as cigarette smoke.

Cancer is a disease caused by uncontrolled cell growth within a person's body. Unlike infectious diseases, cancer cannot spread from one person to another through contact, air, or bodily fluids.

ROM (Read-Only Memory) is a type of computer memory that stores permanent instructions. As the name implies, the computer can read data from ROM but cannot write to or modify it, unlike RAM which is read-write.

Technician A is correct because digital signals are binary, existing in only one of two states (on or off, 1 or 0). Technician B is also correct because analog signals vary continuously and proportionally to represent the measured quantity.

RAM stands for Random Access Memory, a type of computer memory that allows data to be read and written in any order. 'Random access' means the computer can access any memory location directly without going through previous locations sequentially.