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3 years ago

How does the human heart interact with gravity

Biology

1 answer:

emmainna [20.7K]3 years ago

8 0

Answer:

Many parts of the cardiovascular system (including the heart) are influenced by gravity. On Earth, for example, the veins in our legs work against gravity to get blood back to the heart. Without gravity, however, the heart and blood vessels change – and the longer the flight, the more severe the changes.

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In granulocytes, what happens to the nucleus as the cell ages?

jeka94

The granulocytes have been commonly recognised and distinguished histologically by their nuclear shapes and sizes. They contain multi-lobed nuclei, each lobe connected by a short region of nucleoplasm.

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3 years ago

A young female is found floating face-down in a lake. there were no witnesses to the event. prior to removing her from the water

nikitadnepr [17]

I think one must rotate the pt into a supine position and protect her spine.
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3 years ago

Imagine you are sitting in a very quiet room when suddenly behind you there’s a very loud bang, like a firecracker exploding.

lisov135 [29]

Answer:

A. I would be startled by the sudden noise and would probably take cover some wheres. B. My nerves in my ears would send a signal to my brain causing my twitching muscle fibers to react quickly and heart might stop for a moment. C. The heart rate would increase the brain would be aware that there may be more sudden noises or events your adrenaline would be pumping and your quick twitch muscle fibers would probably be tense or contracted ready to make quick sudden movements if necessary and your hairs would stick up i guess as extra senses for if something would touch you.

Explanation:

not to mention but by the time you are startled your senses would probably be heightened due to you being aware of your surroundings such as you would be constantly looking around you would hear better and probably move quicker for a short period of time due to pumping adrenaline.

5 0

3 years ago

Explain the water problems encountered by cells in a

vovikov84 [41]

Answer:

The plant cell becomes turgid

Explanation; freshwater contains a low amount of salt concentration .when cells are placed in it,it creates an osmotic difference, as the cytoplasm of the cell would be of higher concentration than the surrounding water .as a result,water moves into the cell by osmosis.

Most Unicellular organisms has organelles such as contractile vacuole to expel excess water out of it's cell.if the animal cell is unable to expel water,it bursts.

In plants cells,the cell swells and the swelling is checked by the inflexible and rigid cell wall.

The cell wall of plants are made of cellulose, lignin and pectin.

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3 years ago

Isovolumetric relaxation and ventricular filling (two phases of the cardiac cycle) take place during __________. Isovolumetric r

Helga [31]

Answer:

Option B, ventricular diastole

Explanation:

Ventricular diastole also termed as ventricular relaxation consists of two phases. In the first phase, the following set of events takes place –

a) Relaxation of ventricle muscles

b) Reduction in pressure of blood within the ventricles

c) As this reduced blood pressure gets lower than that of pressure with in the pulmonary trunk and aorta, blood starts flowing back towards the heart.

d) A small dip in the blood pressure is observed at this stage

e) Volume at this stage remains constant as the atrioventricular valves remain closed

f) This phase is known as isovolumic ventricular relaxation phase

In the second phase, the following set of events takes place –

a) Relaxation of ventricular muscle

b) Dropping of pressure of the blood within the ventricles lower than that of pressure of blood in the atria

c) Blood starts flowing from atria into the ventricles thereby opening the tricuspid and mitral valves

d) Both the heart chambers chambers are in diastole,

e) Atrioventricular valves are open

f) Semilunar valves remain closed

Hence, option B is correct

3 0

3 years ago