General Science

What are proteins and where are they found?

Proteins are important for the body's maintenance, growth, and repair, and can be found in both animal sources (meat, fish, eggs, cheese) and vegetables (beans, nuts, some grains).

What is the function of carbohydrates?

Carbohydrates are major sources of energy for the body, found in sugars (fruit, cane sugar, beets) and starches (bread, rice, potatoes, pasta).

What are the three types of fats and their sources?

Fats provide energy to the body and come in three types: saturated (found in meats, shellfish, eggs, milk), monounsaturated (found in olives, almonds, avocados), and polyunsaturated (found in vegetable oils).

What is the importance of minerals in diet?

Small quantities of certain minerals like iron, calcium, magnesium, and salt are important for nutrition and health.

What role do vitamins play in the body?

Vitamins are necessary for a wide variety of bodily processes, with some coming from the diet (e.g., Vitamins A and C) and others generated in response to sunlight (e.g., Vitamin D).

What is the purpose of fiber in digestion?

Fiber provides bulk to help the large intestine carry away waste, and good sources include leafy vegetables, beans, potatoes, fruits, and whole grains.

What is an exoskeleton?

An exoskeleton is a type of external skeleton common in arthropods like insects, spiders, and crustaceans.

What is an endoskeleton?

An endoskeleton is an internal skeleton characteristic of vertebrate animals, including humans.

What is the function of bones and cartilage?

Hard bones provide primary support for the endoskeleton while flexible cartilage is found at the ends of all bones, at the joints, and in parts like the nose and ears. Bones also produce blood cells and store minerals.

What are tendons and ligaments?

Tendons are tough fibrous cords of connective tissue that connect muscles to the skeleton, while ligaments connect bones to other bones at joints.

What is respiration?

Respiration is the process by which blood cells absorb oxygen and eliminate carbon dioxide, managed by the respiratory system.

How does the respiratory system filter air?

Air enters through the nose and passes through the nasal cavity which filters, moistens, and warms it, with further filtering occurring in the pharynx and then in the trachea.

Describe the structure and function of the lungs.

The trachea branches into bronchi leading to each lung where they subdivide into bronchioles ending in alveoli, allowing oxygen to enter the bloodstream.

What is the role of the diaphragm in breathing?

The diaphragm is a muscle system that aids in inhalation and exhalation by expanding to draw air in and contracting to push air out.

What is the circulatory system responsible for?

The circulatory system transports oxygen throughout the body, removing carbon dioxide, and also transporting nutrients from the digestive system.

What are the parts of the heart?

The heart has four chambers: two atria that collect blood and two ventricles that pump blood. It also contains valves to prevent backflow.

What is the purpose of the pulmonary artery and vein?

The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs, while the pulmonary vein returns the oxygenated blood to the left atrium.

Describe the blood flow through the heart.

Blood flows in a path: right atrium → right ventricle → lungs → left atrium → left ventricle → body. Blood is deoxygenated when it enters the right side and oxygenated when it leaves the left side.

What is the aorta?

The aorta is the body's largest artery that receives oxygenated blood from the pulmonary vein via the left ventricle and circulates it through the body.

What roles do veins play in circulation?

Veins carry deoxygenated blood back to the heart at low pressure and have valves to prevent backflow.

What are capillaries and their function?

Capillaries are small, thin-walled vessels that permit the exchange of oxygen, carbon dioxide, nutrients, and waste between blood and cells.

What is blood comprised of?

Blood consists of cells suspended in liquid plasma, including red blood cells (carry oxygen), white blood cells (fight infection), and platelets (allow blood clotting).

How are blood types categorized?

Blood is categorized into four types (A, B, AB, and O) based on antigens present on red blood cells, with each type being Rh positive or negative.

What is the universal donor and recipient in blood types?

Type O negative blood is the universal donor, while Type AB positive is the universal recipient.

What happens in the mouth during digestion?

Digestion begins in the mouth where teeth and tongue mechanically break down food, and saliva chemically breaks down starches using salivary amylase.

What occurs in the stomach during digestion?

Food is mixed with gastric acid and pepsin to help break down proteins.

What is the role of the small intestine in digestion?

Most digestion takes place in the small intestine, where enzymes break down food and the resulting substances are absorbed into the blood via capillaries.

What does the pancreas do?

The pancreas produces acids with enzymes that aid in digestion, including lipase for fats, pancreatic amylase for carbohydrates, and trypsin for proteins.

What is the function of the liver in the digestive system?

The liver produces bile which emulsifies fat.

How does the large intestine function in waste processing?

The large intestine absorbs water and minerals from waste produced by digestion and stores solid waste in the rectum and liquid waste in the bladder.

What do the kidneys do?

The kidneys filter chemical waste like excess water, minerals, and salt from the blood, which is excreted as urine.