Answer:
S- shaped spine, adducted hallux and formation of a calcaneous
Explanation:
- The S-shaped spine helps humans stand on two legs in an upright position rather than have to use 4 legs. It aligns and balances the skull allowing it to be upright.
- The adducted hallux is the big toe which has been aligned with the other toes , in primates the big toe is not adducted and is used much like the thumb is on a hand, to hold objects and climb trees. The big toe aids in balance as one stands on the flat ground
- The formation of the calcaneous (heel bone) also aids in balance for when humans stand upright.
A and E is the answer for the two of them
Answer:
the last one is right I think
The ends of the actin filaments are anchored to the Z-line or disk.
The sarcomere is the primary functional unit of muscle fiber. It is flanked by a Z-band on each end with adjoining I-bands. The Z-band or disk is a dense fibrous structure composed of actin, α-actinin as well as other proteins.
Thin filaments or actin filaments are anchored at one end at the Z-band. Titin is connected to both the Z-band and the M-line. Thick filaments are attached in the middle of the sarcomere at the M-line.
An intermediary filament protein forms a meshwork from one Z-disk to the next across the myofibril. These networks are joined by actin through the protein dystrophin to the sarcolemma.
To learn more about sarcomere here
brainly.com/question/14005497
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