Question

question 10
what would be the effect of poor posture?
all of these are correct.
leads to fatigue
puts more strain on ligaments
puts abnormal strain on bones
interferes with respiration, heart action, and digestion
question 11
skeletal muscles are innervated by:
somatic motor neurons.
autonomic motor neurons.
both somatic and autonomic motor neurons.
internal stimulation.
question 12
during inspiration, the _____ flatten(s), thus increasing the size and volume of the cavity.
diaphragm
internal intercostals
external intercostals
splenius capitis

Explanation:

• For Question 10: Poor posture can cause fatigue as muscles have to work harder. It strains ligaments and bones due to abnormal positioning. It can also interfere with bodily functions like respiration, heart - action, and digestion by compressing organs or restricting movement.
• For Question 11: Skeletal muscles are under voluntary control and are innervated by somatic motor neurons. Autonomic motor neurons control involuntary functions like those of smooth and cardiac muscles.
• For Question 12: During inspiration, the diaphragm contracts and flattens, increasing the volume of the thoracic cavity and allowing air to enter the lungs.

Answer:

Question 10: All of these are correct.
Question 11: somatic motor neurons.
Question 12: diaphragm