Answer:  "respiratory tract" .
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The atrioventricular valves.
        
             
        
        
        
Flexibility exercises have been prescribed successfully to treat dysmenorrhea (painful menstruation), general neuromuscular tension (stress) and knots (trigger points) in muscles and fascia.    What are the benefits of good flexibility?  -enhances quality of life   -promotes healthy muscles and joints   -greater freedom of movement   -makes activities of daily living easier  -promotes healthy muscles and joints  -Improves elasticity of muscles and connective tissue around --joints, enhancing freedom of movement  -Makes activities of daily living (turning, lifting, and bending) much easier to perform  -Helps prevent low back and other spinal column problems  -Improves and maintains good postural alignment  -Promotes proper and graceful body movement  -Improves personal appearance and self-image  -Helps develop and maintain motor skills throughout life
        
             
        
        
        
The answer is , it grows into Protonema , not more moss, not yet.
dose this help?