Geologist have divided earth history into time unit what are largely based on

1 answer:

6 0

Geologists have divided the earth history into time units that are largely based on the earth's biotic composition. The modern geological time scale includes both relative and absolute age dating and represents the most up-to-date assessment of the earth's history. In the modern geological time scale, the eras in earth's history when the planet was populated with advanced life forms are referred to as the Paleozoic (meaning ancient life), the Mesozoic (meaning middle life), and the Cenozoic (meaning recent life).

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Name the four most important ligaments of the knee. What condition is characterized by an irritation and softening of the cartil

Alex787 [66]

Answer:

1. Medial collateral ligament, lateral collateral ligament, anterior cruciate ligament and posterior cruciate ligaments.

2. Chondromalacia patellae

Explanation:

The knee is a ginglymus that connects the thigh to the leg. It is the largest joint in the human body, that plays a vital role in the horizantal and the vertical movement of the body.

There are four ligaments of knee joint, that joins the femur to the tibia and also provides stability by limiting movement. They are: medial collateral ligament, lateral collateral ligament, anterior cruciate ligament and posterior cruciate ligaments.

Chondromalacia patellae is a medical condition that includes inflammation of the cartilage on the posterior aspect of the patella, which leads to softening of the cartilage.

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3 years ago

Does kinetic energy have more energy in the solid state than in the liquid state?

Angelina_Jolie [31]

Answer:

Liquids have more kinetic energy than solids

Explanation:

When a substance increases in temp, heat is being added, and its particles are gaining kinetic energy.

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How can you use your ears to help you find where a sound is coming from?

Sliva [168]

Answer:

WELL UMMMMM.....

Explanation:

THERE ARE SOUND WAVES THAT TRAVEL THROUGH THE AIR AND YOUR EAR HEARS SOUNDS FROM THAT SO YAAA

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Cross bridge formation between myosin heads and actin molecules is caused by the elevation of calcium ion concentration in the c

almond37 [142]

Answer:

sarcoplasmic reticulum deteriorates and ATP production is stopped

Explanation:

Rigor mortis is the third stage of death characterized by stiffening of joints and muscles in body. The stiffening occurs because muscles are not able to return to the relaxed state. There are two reasons for rigor mortis, depletion of ATP and increase in calcium concentration in cytosol. Due to these factors the actin-myosin crossbridge is not able to break and the muscles remain in contracted state.

Sarcoplasmic reticulum deteriorates and calcium is released into the cytosol. Sarcolemma ( covering of muscle fiber ) also breaks down releasing extra calcium into the cytosol. Calcium is responsible for formation of actin-myosin cross bridge and when its concentration increases the bridge is formed continuously leading to stiffening of muscles and joints.

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Match the chemical signal with the appropriate description.

Lyrx [107]

a. chemicals produced by neurons that function as hormones—neurohormones
b. chemicals that act locally on nearby cells—paracrine factors
c. chemicals secreted by presynaptic terminal—neurotransmiters
d. influences same cell type from which it is secreted—autocrine agent
e. chemical secreted into the blood by specialized cells; travels some distance to target tissues—endocrine hormones

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