The number of consumers increases
Animals with a three-chambered heart would include Amphibians.
- Amphibians have three-chambered which comprises of two Atria and one ventricle. Examples of Amphibians include Frog, Toads, Salamanders.
- In Amphibians heart blood from the single ventricle travels to the lungs, skin, and body, where it is oxygenated. Before being pumped out of the heart, deoxygenated and oxygenated blood are mixed in the ventricle.
- This is because the Amphibians have low rate of metabolism and thus requires less oxygen for their metabolism.
- As a result heart's load to deliver oxygenated blood to body is lowered.
Thus, from the above pointers we can conclude that only Amphibians from the option have three-chambered heart.
Learn more about Amphibians:
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The source of the oxygen released into the air as a product of photosynthesis is C) Water only.
You can use your maximum heart rate (MHR) to calculate how hard you should work.
Sternocleidomastoid muscles.
Explanation:
The neck movements like flexion, rotation, extension, lateral rotation and flexion are carried out by neck muscles which include the sternocleidomastoid muscle,
The sternocleidomastoid muscle is a pair of muscle located superficially in the anterior neck.
The sternocleidomastoid muscles connects skull with the clavicle and hence is involved the head and neck motions.
The `bilateral contraction movements of sternocleidomastoid muscles aids in flexion of the neck and brings the chin down towards the breastbone.
Platysma is a facial muscle and involved in facial expressions and mandibular movements
Semispinalis muscle is in the posterior neck and maintains posture and head movements.
Trapezius muscles lies at the back of the head.
