Dietary fiber promotes digestion by aiding in the movement of food through the digestive tract.

The main function of dietary fiber is to promote digestive health by aiding in bowel regularity.

Fats serve as a major source of energy storage in the body, providing 9 calories per gram.

Ligaments connect bone to bone, providing stability to joints.

Lipids primarily function in energy storage, as well as forming cell membranes.

Lipids serve as a major form of energy storage in the body.

Phloem is responsible for the transport of food (sugars) produced during photosynthesis from leaves to other parts of the plant.

Plasma is the liquid component of blood that carries nutrients, hormones, and waste products throughout the body.

Producers, such as plants, produce energy through photosynthesis, forming the base of the food chain.

Red blood cells are primarily responsible for transporting oxygen from the lungs to the rest of the body.

Red blood cells are primarily responsible for transporting oxygen from the lungs to the rest of the body, making option 2 the correct answer.

Sepals protect the flower bud before it opens.

Skeletal muscle tissue is responsible for voluntary movements of the body, allowing for locomotion and manipulation.

Stratified squamous epithelium primarily functions in protection against abrasion and pathogens.

Surfactant reduces surface tension in the alveoli, preventing their collapse and making it easier for the lungs to expand during inhalation.

The anther is the part of the stamen that produces and contains pollen grains.

The cell wall provides protection and structural support to plant cells, maintaining their shape.

The digestive system breaks down food into nutrients, which are then absorbed into the bloodstream for energy.

Gastric acid activates digestive enzymes, particularly pepsinogen to pepsin, and helps in protein digestion.

Gastric juice contains hydrochloric acid and pepsin, which are essential for the digestion of proteins.

The immune system's primary function is to protect the body against pathogens and diseases.

Stomata are small openings on the leaf surface that facilitate gas exchange, allowing carbon dioxide in and oxygen out.

The primary function of the male reproductive system is to produce sperm for reproduction.

The nephron is the functional unit of the kidney responsible for the filtration of blood and the formation of urine.

The nucleus stores the cell's genetic information and coordinates activities such as growth, metabolism, and reproduction.

The nucleus stores genetic information and controls cellular activities by regulating gene expression.

The main function of the operating system is to manage hardware resources and provide a user interface.

The pancreas produces digestive enzymes that help in the digestion of carbohydrates, proteins, and fats.

The renal pelvis collects urine from the collecting ducts and transports it to the ureter.

The main function of the respiratory system is gas exchange, specifically the intake of oxygen and the removal of carbon dioxide.