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3 years ago

Match these examples with the correct level of organization. Please hurry!!!

Biology

2 answers:

irina [24]3 years ago

8 0

Answer:

Organ systems: human body and circulatory system

organs: heart

tissue: muscle

Explanation:

Anvisha [2.4K]3 years ago

3 0

Answer:

Organ system → Circulatory system

Organ → Heart

Tissue → Cardiac muscle

Explanation:

The human body is a complex set of various organ systems. An organ system is a set of organs that work in a coordinated manner to perform various functions.

The circulatory system, for example, is made up of two systems: the lymphatic system (which carries lymph to the heart) and the cardiovascular system (which takes care of the blood flow throughout the body).

Thus, the circulatory system is formed by the heart, capillaries, veins, arteries, lymphatic vessels, thymus, spleen, lymph nodes, lymphatic tissues and bone marrow.

Organ, in turn, is a structure formed by a group of tissues that perform a specific function or group of functions.

For example, the heart, whose primary function is to pump blood throughout the body.

Tissues are sets formed by similar cells. Each type of tissue is capable of performing a specific function. Each organ may consist of one or more tissues.

The cardiac muscle tissue, for example, is responsible for involuntary contractions (regardless of one's will) of the heartbeat in a vigorous and rhythmic manner.

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Mike earned scores of 88,91,75,and 72 on four math tests determine his score on the fifth test if his average for five tests was

My name is Ann [436]

Explanation : x = 79 marks

The marks scored by Mike on four math test are 88,91,75 and 72.

Average of marks, A = 81

Let in fifth test he scores x marks.

The formula for finding average is :

$A=\dfrac{sum\ of\ scored\ marks}{no.\ of \ tests}$

$81=\dfrac{88+91+75+72+x}{5}$

$\dfrac{326+x}{5}=81$

$x=79$

In the fifth test he scores 79 marks.

Hence, this is the required solution.

4 0

3 years ago

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Question 5 unsaved adding a unit to move a susceptible group enough to prevent metabolism is known as

mrs_skeptik [129]

adding a unit to move a susceptible group enough to prevent metabolism is known as shifting.
These phenomena happen especially for liposoluble organism circulating in blood like drugs an hormones.
these molecules circulating blood can be divided into two forms :
The free-form: which is the active part, it circulates freely in the blood, but are easily metabolised.
The bound form: it can be bound to other molecules from the organisms depending on its affinity like proteins (albumin, glycoproteins). this form is not active but is prevented from metabolism.

Competition for bounding proteins can happen between two drugs for example. If they have a different degree of affinity for proteins, then the most affine will displace the less affine from the protein and bound it, and that is call shifting

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3 years ago

Describe how blood is pumped and circulated through the body. Include the roles of the various chambers of the heart, the major

Korvikt [17]

The heart is a pump, usually beating about 60 to 100 times per minute. With each heartbeat, the heart sends blood throughout our bodies, carrying oxygen to every cell. After delivering the oxygen, the blood returns to the heart. The heart then sends the blood to the lungs to pick up more oxygen. This cycle repeats over and over again.

The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart.

The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide. These roadways travel in one direction only, to keep things going where they should.

The heart has four chambers — two on top and two on bottom:

The two bottom chambers are the right ventricle and the left ventricle. These pump blood out of the heart. A wall called the interventricular septum is between the two ventricles.

The two top chambers are the right atrium and the left atrium. They receive the blood entering the heart. A wall called the interatrial septum is between the atria.

The atria are separated from the ventricles by the atrioventricular valves:

The tricuspid valve separates the right atrium from the right ventricle.

The mitral valve separates the left atrium from the left ventricle.

Two valves also separate the ventricles from the large blood vessels that carry blood leaving the heart:

The pulmonic valve is between the right ventricle and the pulmonary artery, which carries blood to the lungs.

The aortic valve is between the left ventricle and the aorta, which carries blood to the body.

What Are the Parts of the Circulatory System?

Two pathways come from the heart:

The pulmonary circulation is a short loop from the heart to the lungs and back again.

The systemic circulation carries blood from the heart to all the other parts of the body and back again.

In pulmonary circulation:

The pulmonary artery is a big artery that comes from the heart. It splits into two main branches, and brings blood from the heart to the lungs. At the lungs, the blood picks up oxygen and drops off carbon dioxide. The blood then returns to the heart through the pulmonary veins.

In systemic circulation:

Next, blood that returns to the heart has picked up lots of oxygen from the lungs. So it can now go out to the body. The aorta is a big artery that leaves the heart carrying this oxygenated blood. Branches off of the aorta send blood to the muscles of the heart itself, as well as all other parts of the body. Like a tree, the branches gets smaller and smaller as they get farther from the aorta.

At each body part, a network of tiny blood vessels called capillaries connects the very small artery branches to very small veins. The capillaries have very thin walls, and through them, nutrients and oxygen are delivered to the cells. Waste products are brought into the capillaries.

Capillaries then lead into small veins. Small veins lead to larger and larger veins as the blood approaches the heart. Valves in the veins keep blood flowing in the correct direction. Two large veins that lead into the heart are the superior vena cava and inferior vena cava. (The terms superior and inferior don't mean that one vein is better than the other, but that they're located above and below the heart.)

Once the blood is back in the heart, it needs to re-enter the pulmonary circulation and go back to the lungs to drop off the carbon dioxide and pick up more oxygen.

How Does the Heart Beat?

The heart gets messages from the body that tell it when to pump more or less blood depending on a person's needs. For example, when you're sleeping, it pumps just enough to provide for the lower amounts of oxygen needed by your body at rest. But when you're exercising, the heart pumps faster so that your muscles get more oxygen and can work harder.

How the heart beats is controlled by a system of electrical signals in the heart. The sinus (or sinoatrial) node is a small area of tissue in the wall of the right atrium. It sends out an electrical signal to start the contracting (pumping) of the heart muscle. This node is called the pacemaker of the heart because it sets the rate of the heartbeat and causes the rest of the heart to contract in its rhythm.

4 0

3 years ago

If p + q = 1, and we now know that q = .5, what is p?

TEA [102]

Answer:

0.5

Explanation:

1-0.5=0.5

q-p=answer

8 0

4 years ago

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An object has a weight of 21,532 N on Earth. What is the mass of the object?

Nuetrik [128]

7) 2,197 kg

The weight of an object on Earth is given by:

$W=mg$

where m is the mass of the object and $g=9.8 m/s^2$ is the acceleration due to gravity. Since we know the weight of the object, W=21,532 N, we can re-arrange the equation to calculate the object's mass:

$m=\frac{W}{g}=\frac{21,532 N}{9.8 m/s^2}=2,197 kg$

8) 2,197 kg

Mass is an intrinsec property of an object: it says "how much matter" is contained within an object. Therefore, the mass of an object does not depend on its location: so, the object has the same mass on Earth and on the moon, and so its mass is still the same as the previous exercise, 2,197 kg.

9) 187,500 N

The force exerted on an object is given by Newton's second law:

$F=ma$

where m is the mass of the object and a its acceleration. In this problem, $m=250 kg$ and $a=750 m/s^2$ , so the force exerted on the object is

$F=(250 kg)(750 m/s^2)=187,500 N$

10) 2nd Law

Newton's second law states that an object which is acted upon a force experiences an acceleration given by:

$a=\frac{F}{m}$

where F is the force and m the mass of the object. As a result, the object accelerates, so if it was at rest, it starts moving.

This is exactly what happens in this example: the ball is initially at rest, but then a force is applied on it (by the kick), so the ball is accelerated and it starts moving.

3 0

3 years ago

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