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Nata [24]
3 years ago
15

The heart has structures that are called_____. This allows the blood to move in one direction.

Physics
2 answers:
Anarel [89]3 years ago
5 0

Answer:

valves

The heart has four valves - one for each chamber of the heart. The valves keep blood moving through the heart in the right direction.

spayn [35]3 years ago
4 0

Answer:

Valves

Explanation:

The valves help the blood move in just one direction while the veins are many.

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8 0
3 years ago
PLEASE HELP!! Newtons first law states that if an objects velocity is changing a __________ must be acting on it. Question 1 opt
Anika [276]

Newtons first law states that if an objects velocity is changing a <u>force</u> must be acting on it.

Explanation:

Newton's first law of motion states that:

"An object at rest (or in uniform motion) will remain at rest (or will continue moving with the same velocity) unless acted upon an unbalanced force"

We can apply this law to a daily life example:

  • Take a book at rest on a table: the forces acting on the book are balanced. If we do not apply any other force, we know that the book will remain at rest: this is exactly what is summarized in Newton's first law.
  • Take a space probe moving in the interstellar space, very far from any planet or source of gravitational force. Since there are no forces acting on the proble, the probe will continue moving at the same velocity (same speed and same direction) forever, unless stopped by a new force acting on it.

This means that in order to put an object at rest in motion, or to stop an object already in motion, or to change its velocity, an unbalanced force needs to be applied: otherwise, the object will continue having the same velocity (which can be either zero or non-zero), so it will continue having  same speed and same direction.

Learn more about Newton laws of motion:

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5 0
3 years ago
How does the acceleration due to gravity relate to the mass of an object and the distance from Earth?
Irina18 [472]
The object's mass is irrelevant.
The acceleration due to Earth's gravity is inversely proportional to the square of the object's distance from the center of the Earth.
6 0
3 years ago
Exercise can help to prevent which potential health problem? a). head lice b). chicken pox c). heart disease d). strep throat
Mrac [35]

Answer:

C

Explanation:

Exercise also increases your levels of HDL cholesterol, the "good" cholesterol that lowers heart disease risk by flushing the artery-clogging LDL or "bad" cholesterol out of your system.

5 0
4 years ago
Read 2 more answers
What do waves transmit? (Points : 1)
Mamont248 [21]
Energy

Waves carry energy as they travel.
8 0
3 years ago
Read 2 more answers
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