Which type of bone marrow is primarily responsible for hematopoiesis?

. Producing mucus for the respiratory tract: Mucus is produced by goblet cells in the airway lining to trap dust, microbes, and other particles, not by alveoli.

B. Gas exchange between oxygen and carbon dioxide: Alveoli are tiny, thin-walled sacs at the end of bronchioles. Their large surface area and close association with pulmonary capillaries allow efficient diffusion of oxygen into the blood and carbon dioxide out of the blood.

C. Filtering dust particles from inhaled air: Filtration occurs primarily in the nasal passages, cilia, and mucus of the upper and lower airways, not within the alveoli.

D. Maintaining the shape of the lungs: Lung shape is maintained by the thoracic cavity, connective tissue, and surfactant, while alveoli function mainly in gas exchange.

A. Provide structural support to the body: Structural support is mainly provided by the skeletal system and connective tissues, not the nervous system.

B. Produce hormones for growth and development: Hormone production is the role of the endocrine system; the nervous system may influence hormone release but does not directly produce them.

C. Transmit signals between different parts of the body: The nervous system communicates via electrical and chemical signals between the brain, spinal cord, and peripheral organs, coordinating responses to stimuli and maintaining homeostasis.

D. Regulate the body's temperature: Temperature regulation is managed primarily by the hypothalamus and autonomic responses, with the nervous system playing a coordinating role rather than being the primary regulator.