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vovikov84 [41]
3 years ago
15

How do you properly heat a test tube in the lab?

Biology
2 answers:
Kamila [148]3 years ago
8 0

Answer:

Hold the test tube at an angle.  point the test tube away from yourself and all other people. Heat the test tube gently from the top of the substance being heated, and always wear safety goggles.

Explanation: Can you plz accept my invite to be your friend I am 15 in high school 10th grade Colgan High School, You are beautiful a compliment

stepan [7]3 years ago
6 0
• Wear safety goggles
• Hold the test tube at an angle. Point the test tube away from yourself and all other people. Heat the test tube over the bunsen burner gently from the top of the substance being heated, and always.
hope this helps x
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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
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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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3 years ago
A postmenopausal female client diagnosed with osteoporosis asks the nurse how a decrease in estrogen can cause problems with bon
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Answer:

The correct answer is option a.

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8 0
3 years ago
A population of tree frogs living in the Amazon rainforest have two skin color phenotypes controlled by the same gene. Hozygous
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A

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7 0
3 years ago
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Which one of these is the most accurate in determining the absolute age of two rocks?
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Radioactive dating, depending on the certain amount of radioactive decay it leaves through the years you can predict the oldest one!

if that helped make sure to mark brainliest! <3
-procklown

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3 years ago
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