Human Physiology and Anatomy

In diabetes, high blood sugar levels lead to excess glucose being filtered into the urine, causing glycosuria (presence of sugar in urine). This is a key diagnostic feature of diabetes.

The small intestine is the primary site for the absorption of nutrients from digested food due to its large surface area and specialized structures like villi and microvilli. The large intestine mainly absorbs water and electrolytes, while the liver processes nutrients but does not absorb them from food.

The question asks about the volume of blood pumped by the human heart with each contraction, which is known as the stroke volume and is typically measured in milliliters (mL), not centimeters (cm). The average stroke volume is about 70 mL, so none of the given options with units in cm are correct. Therefore, 'None of these' is the correct answer.

The liver is the largest gland in the human body because it performs numerous vital functions including detoxification, protein synthesis, and production of biochemicals necessary for digestion. Other options like the pancreas and sweat glands are glands but are smaller in size compared to the liver.

The aorta is the main artery that carries oxygenated blood from the heart to the rest of the body, making it a part of the circulatory system. It is not related to the skeleton or skull.

The lifespan of white blood cells varies widely depending on the type; some live only a few hours to days, while others can live for months or years. None of the given options accurately reflect this range, so 'None of these' is the correct choice.

The color of blood is due to hemoglobin, a protein in red blood cells that binds oxygen and gives blood its red color. Oxygen itself is colorless, and hydrogen is unrelated to blood color.

Arteries are the blood vessels that carry oxygenated blood away from the heart to the body tissues. Veins carry deoxygenated blood back to the heart, and capillaries are small vessels where exchange of gases occurs.

Growth hormone primarily acts on most somatic cells to stimulate growth, cell reproduction, and regeneration. While it affects various tissues, its main regulatory function is on somatic cells rather than nerve or liver cells specifically.

The number of muscles in the human body varies depending on the counting method and source, but most reliable sources agree there are over 600 muscles. Estimates commonly range from about 600 to 840 muscles, with around 639 often cited as a standard count for skeletal muscles. The exact number can vary due to anatomical variations and how muscles are classified. Therefore, option A (639) is the most accurate choice among the given options.

The adult human skeleton typically consists of 206 bones. This is a well-established fact in human anatomy.

Each human hand contains 27 bones: 8 carpal bones in the wrist, 5 metacarpal bones in the palm, and 14 phalanges in the fingers. Therefore, option C is correct.

Growth hormone primarily affects most somatic cells by stimulating growth, cell reproduction, and regeneration. It does not directly regulate nerve cells, so option B is correct.

Blood vessels are flexible and elastic to accommodate blood flow and pressure changes, so they are not rigid. This flexibility is essential for their function in the circulatory system.

The concentration of red blood cells in blood, known as hematocrit, is typically about 40-45% in healthy adults. Therefore, option B (40%) is the most accurate choice.

Systolic pressure is the pressure in the arteries when the heart contracts and pumps blood. It is represented by the top number in a blood pressure reading and indicates the peak force exerted on artery walls during heartbeats. While 'high blood pressure' or hypertension refers to elevated systolic or diastolic values, systolic pressure itself is the measurement of pressure during heart contraction, which is typically higher than diastolic pressure.

The instrument used to measure blood pressure is called a sphygmomanometer. It typically consists of an inflatable cuff to restrict blood flow and a mercury or aneroid manometer to measure the pressure.

At systolic pressure, blood flow tends to be turbulent due to the higher velocity and pressure causing disturbances in the flow. Laminar flow is more typical at lower pressures and velocities, such as during diastole.

Blood pressure is influenced by gravity and body position. When lying horizontally, the heart and the rest of the body are at the same level, minimizing the effect of gravity on blood pressure, resulting in the smallest maximum blood pressure compared to standing or sitting positions.

Normal human body temperature is approximately 98.6°F, which corresponds to 37°C. The other options are far outside the normal human body temperature range.

The human vertebral column typically consists of 33 vertebrae, which are divided into cervical, thoracic, lumbar, sacral, and coccygeal regions. This is the standard anatomical count in humans.

The normal resting breathing rate for a healthy adult human is typically between 12 and 20 breaths per minute. Option B (16-20 minutes) best fits this range, although the unit should be 'breaths per minute' rather than 'minutes'.

The stapes is the smallest bone in the human body, located in the middle ear. It is much smaller than the other bones listed, such as the tibia, femur, and humerus, which are long bones in the legs and arms.

The heart pumps deoxygenated blood to the lungs via the pulmonary artery for oxygenation. This blood is low in oxygen and high in carbon dioxide before reaching the lungs.

Endocrinology is the branch of biology and medicine that studies glands and the hormones they produce. The other options are unrelated: cardiology studies the heart, entomology studies insects, and 'None of these' is incorrect.