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3 years ago

When molten material hardens into rock on the ocean floor, the domains of the iron it contains

Biology

2 answers:

Neporo4naja [7]3 years ago

8 0

Answer:

Option B. line up in the direction of Earth’s magnetic field.

Explanation:

In a molten rock, traces of iron found align themselves in the direction of earth’s magnetic field. This happens because each tiny particle of iron in the molten rock act as a small magnet with magnetic north and south poles. These poles re-orient themselves as per the direction of earth’s magnetic field. This happens till the rock is in molten stage, once it gets solidified the minute magnets gets stable in one orientation.

Hence, option B is correct.

Charra [1.4K]3 years ago

6 0

When molten material hardens into rock on the ocean floor, the domains of the iron it contains.

Answer: B. line up in the direction of Earth's magnetic field.

Good luck and have a nice Benevolentpuppy day! :)

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tendons of the rotator cuff muscles hold the head of the humerus to the glenoid cavity of the scapula

AnnZ [28]

The rotator cuff muscles hold the head of the humerus to the glenoid cavity of the scapula with subscapularis, supraspinatus, infraspinatus, and teres minor muscles' tendinous.

What is rotator cuff muscles?

The rotator cuff is a collection of muscles in the shoulder that supports stability of the glenohumeral joint while allowing for a large range of motion. The following muscles make up the rotator cuff: Subscapularis. Infraspinatus. Minor Teres.

What is glenoid cavity of the scapula?

The term "glenoid fossa" refers to the glenoid hollow. The pectoral girdle's lateral scapula bone, often known as the shoulder blade, has a slight dip there. The glenohumeral joint connects the upper limb's humerus to the glenoid cavity.

The subscapularis, supraspinatus, infraspinatus, and teres minor muscles' tendinous insertions combine to form the tendinous band known as the rotator cuff. During joint motion, these muscles support the humeral head's rotation against the glenoid fossa.

Therefore, the rotator cuff muscles hold the head of the humerus to the glenoid cavity of the scapula with subscapularis, supraspinatus, infraspinatus, and teres minor muscles' tendinous.

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1 year ago

artcher [175]

Answer:

C The sarcomere is contracted, and the actin and myosin filaments are completely overlapped.

Explanation:

In rest, the tropomyosin inhibits the attraction strengths between myosin and actin filaments. Contraction initiates when an action potential depolarizes the inner portion of the muscle fiber. Calcium channels activate in the T tubules membrane, releasing calcium into the sarcolemma. At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to troponin C, troponin T alters the tropomyosin position by moving it and unblocking the binding sites. Myosin heads join the uncovered actin-binding points forming cross-bridges, and while doing so, ATP turns into ADP and inorganic phosphate, which is released. Myofilaments slide impulsed by chemical energy collected in myosin heads, producing a power stroke. The power stroke initiates when the myosin cross-bridge binds to actin. As they slide, ADP molecules are released. A new ATP links to myosin heads and breaks the bindings to the actin filament. Then ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, which starts a new binding cycle to actin. Finally, Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.

In the sarcomere, which is the contractile unit of skeletal muscles, there are

Thick myosin myofilaments in the central region belonging to the A band.

Thin filaments united to the Z lines, extending in the interior of the A band until they reach the border of the H band.

Thin actin filaments composing the I band, which belong to two sarcomeres adjacent to a Z line.

When the muscle contracts, the muscular fiber gets shorter and thicker due to the reduction in the length of the sarcomere. The H line and the I band get shorter. The Z lines get closer to the A band, meaning that they get closer to each other. A band keeps constant in length. This change is produced by movement mechanisms that involve a change in the relative position of actin and myosin filaments.

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