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loris [4]
3 years ago
10

A growing fetus has a vessel, the ductus arteriosus, in the heart that connects the pulmonary artery with the aorta and conducts

blood directly from the right ventricle to the aorta. Why do you think this vessel closes soon after birth?
Health
1 answer:
kirill115 [55]3 years ago
3 0

Answer:

The baby starts breathing

Explanation:

While in the womb, a fetus has its oxygen delivered to it, and the waste products removed (all via the mother's bloodstream), so there is no reason to separate all the chambers of the heart while still in the womb.

However, once the baby is born and it is breathing, the chambers need to differentiate in order to allow the blood to reach the lungs, and the oxygenated blood and deoxygenated blood do not mix.

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Which muscles move the arm
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Answer:

1- common origin for muscles that move the arm

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2- common insertion for muscles that move the arm

humerus (except latissimus dorsi and pectoralis major)

3- common innervation of muscles that move the arm

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origin: scapula

insertion: humerus

innervation: cervical nerve

action: adduction and flexion of shoulder

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action: abduction of shoulder

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insertion: humerus

innervation: cervical nerve

action: abduction at shoulder

7- infraspinatus muscle

origin: scapula

insertion: humerus

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action: lateral rotation of shoulder

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origin: scapula

insertion: humerus

innervation: cervical nerve

action: medial rotation of the shoulder

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insertion: humerus

innervation: cervical nerve

actions

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10- triceps brachii (long head)

origin: scapula

insertion: humerus

innervation: cervical nerve

action: extension at the elbow

11- latissimus dorsi

origin: spinous process T7-T12

insertion: intertubercular groove of humerus

innervation: cervical nerve

action: abduction and medial rotation of shoulder

12- pectoralis major

origin: clavicle and sternum

insertion: intertubercular groove of humerus

innervation: cervical nerve

action: flexion, extension, adduction, medially rotate arm at shoulder

13- origin of latissimus dorsi

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14- insertion of latissimus dorsi

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15- action of latissimus dorsi

abduction and medially rotate shoulder

16- origin of pectoralis major

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17- insertion of pectoralis major

intertubercular groove

18- action of pectoralis major

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