Question

please check my answers for fan and medal!!
(questions in comments)

Answer 1

"According to NASA, Astronauts experience a 1% loss of bone per month in space. Under microgravity conditions, osteoblast activity decreases and osteoclast activity increases ."

Based on this information, which of the following explains the risks an astronaut might experience after a long mission in space?

Bone stress would cause bone tissue to thicken.

Bone erosion would cause hormonal secretions that decrease the absorption of calcium.

Bone destroying cells would outnumber bone-building cells causing thinning.<- my ans

Bone absorption would cause the matrix to lack calcium.

Answer 2

Which of the following shows the correct order in which sound information travels through the ear?

Ossicles, eardrum, cochlea, cochlear nerve<- my ans

Eardrum, ossicles, cochlear nerve, cochlea

Eardrum, ossicles, cochlea, cochlear nerve

Ossicles, eardrum, cochlear nerve, cochlea

Answer 3

Which of the following allows groups of skeletal muscle cells to perform coordinated contractions?

Their sarcolemma is fused to the tendons, allowing them to function without continual nerve stimulation.

Their cells are branched and joined end to end, allowing them to function without continual nerve stimulation.

They contain a complex network of striations, allowing more efficient cell-to-cell communication<- my ans

They are connected into multinucleate tissues, allowing more efficient cell-to-cell communication.

Answer 4

Which of the following correctly matches examples of endocrine and exocrine glands?

Exocrine = pancreas; endocrine = sweat glands

Exocrine = sweat glands; endocrine = pancreas

Exocrine = wax gland of ears; endocrine = mucous glands<- my ans

Exocrine = mucous glands; endocrine = wax gland of ears

Answer 5

A student simulates muscle contraction in a model using the following order of events:

Calcium pumps of the sarcoplasmic reticulum open.
Tropomyosin moves.
Calcium ions bind to troponin.
Myosin heads bend to attach to actin filaments.

Based on the order of steps in the student's model, will the muscle successfully contract?
Yes, the muscle model will successfully contract because the sequence is correct

No, because tropomyosin cannot move before the myosin heads attach to actin<- my ans

No, because tropomyosin cannot move before calcium ions bind to troponin

No, because the calcium pumps cannot open before the tropomyosin moves

Answer 6

At a myoneural junction, what is the function of the motor end plate?

To release neurotransmitters that travel toward the axon terminal<- my ans

To bind neurotransmitters and generate an action potential in the sarcolemma

To release sodium and potassium that travel toward the axon terminal

To bind sodium and potassium and generate an action potential in the sarcolemma

Answer 7

@Conqueror @dan815 @freckles @ParthKohli @welshfella could you help me?

Answer 8

@prowrestler