Question

1. which system works closely with the respiratory system to deliver oxygen and remove carbon dioxide from tissues?

a) nervous system
b) cardiovascular system
c) digestive system
d) lymphatic system

1. which of the following structures is not part of the respiratory system?

a) pharynx
b) larynx
c) esophagus
d) trachea

1. what is the role of the conducting zone in the respiratory system?

a) gas exchange
b) warm, moisten, and filter incoming air
c) produce mucus
d) contract to expand the lungs

1. the epiglottis prevents food from entering which structure?

a) esophagus
b) nasal cavity
c) larynx
d) trachea

Explanation:

1. The cardiovascular system (blood vessels and heart) transports oxygen - rich blood from the lungs (after gas exchange in the respiratory system) to tissues and takes carbon - dioxide - rich blood back to the lungs.
2. The esophagus is part of the digestive system. The pharynx, larynx, and trachea are all part of the respiratory tract.
3. The conducting zone (e.g., nasal cavity, trachea, bronchi) warms, moistens, and filters the incoming air. Gas exchange occurs in the respiratory zone (alveoli). Mucus production is a function of some cells in the conducting zone but not the main role. Muscle contraction to expand lungs is related to the diaphragm and intercostal muscles.
4. The epiglottis is a flap of tissue that covers the larynx during swallowing to prevent food from entering the lower respiratory tract (trachea). The esophagus is for food passage (digestive system), and the nasal cavity is for air intake (upper respiratory tract, but the epiglottis mainly protects the larynx - trachea connection).

Answer:

1. B. Cardiovascular system
2. C. Esophagus
3. B. Warm, moisten, and filter incoming air
4. C. Larynx