Pharynx opens into trachea through

Middle ear opens into the inner ear through

Which of the following group constitute the right pathway of gases in the respiratory system ? A. Nostrils to Nasal cavity to Larynx to Pharynx to Bronchus to Trachea to Bronchioles to Alveolus to Blood B.Nostrils to Nasal cavity to Pharynx to Larynx to Trachea to Bronchus to Bronchioles to Alveolus to Blood

Spongocoel opens out through

Which -of the following group constitute the right passage of food in the alimentary canal ? A) Food to mouth to buccal cavity to pharynx to oesophagus to stomach to large intestine to small intestine to anus to rectum B) Food to mouth to buccal cavity to pharynx to oesophagus to stomach to small intes-tine to large-intestine to rectum to anus

Lymph hearts open into these veins in frog

Entry of food into trachea is prevented by

Fill in the blanks: Cilia of trachea transfers mucus into _____________________.

The ducts in male reproductive system of earthworm that open exterior through pores in 18^(th) segment are

Why does the exchange of gases happen only in alveoli, though arteries are present in pharynx, trachea and bronchus?

Forests of nephridia open out through