When an athlete's body temperature begins to climb, blood vessels in the skin dilate. As a result, the athlete's face turns red because warm, oxygenated blood moves to the surface of the skin. This process helps to reduce overall body temperature and prevent overheating.

Question

Which organ system most likely helps to keep an athlete from overheating?
A.
the digestive system

B.
the circulatory system

C.
the respiratory system

D.
the reproductive system

Answer 1

B.
the circulatory system

Answer 2

Blood consists of many different types of cells. These cells work together to keep a person's blood healthy. Which of the following BEST classifies blood?
A.
organ

B.
tissue

C.
organism

D.
organ system

Answer 3

B.
tissue

Answer 4

Which of the following is an example of an organ system?
A.
a human bladder storing waste for removal from the body

B.
a plant's roots absorbing water and minerals from soil

C.
the living material that lines the inside of a cheek

D.
a heart, arteries, and veins all working together

Answer 5

D.
a heart, arteries, and veins all working together

Answer 6

Which two systems interact most to supply the body with nutrients?
A.
The endocrine system produces hormones that regulate hunger, and the muscular system assists the body in moving food into the stomach.

B.
The digestive system breaks down the food to make it available for absorption, and the circulatory system transports the nutrients to parts of the body.

C.
The nervous system stimulates the appetite, and the excretory system removes waste that was not absorbed by the body.

D.
The skeletal system absorbs all the nutrients needed for the body, and the integumentary system removes excess liquid from food.

Answer 7

B.
The digestive system breaks down the food to make it available for absorption, and the circulatory system transports the nutrients to parts of the body.

Answer 8

Which organelle in a plant cell captures radiant energy from the Sun?
A.
chloroplast

B.
mitochondrion

C.
ribosome

D.
nucleus

Answer 9

A.
chloroplast

Answer 10

The graph below shows how the respiratory system changes as a person goes from resting to running to walking to resting again. The respiration rate is the number of breaths a person takes per minute.

Based on the graph, which of the following is a function of the respiratory system?
A.
to deliver oxygen to cells for cellular respiration at different rates so that different amounts of energy can be made when needed

B.
to detect changes in the outside world through nerve impulses and send these impulses throughout the body

C.
to increase the breathing rate during heavy activity so that more carbon dioxide can be absorbed by respiratory cells

D.
to decrease a person's heartbeat during heavy activity and decrease the flow of blood to areas that will pool with blood

Answer 11

A.
to deliver oxygen to cells for cellular respiration at different rates so that different amounts of energy can be made when needed

Answer 12

1 of 21 of 2 Items
Question 1
1. Simplify the expression:  (2x + 2) − (3x + 11) = 
(1 point)
Responses

−x − 13
−x − 13

−5x − 13
−5x − 13

−x − 9
−x − 9

5x − 9
5x − 9
Question 2
2. Simplify the expression:   6(3x−5)+2(3x−5)−8(3x−5)
(1 point)
Responses

24x−40
24 x minus 40

48x−80
48 x minus 80

0
0

35x−60
35 x minus 60
Question 3
3. Which expression is equivalent to −5x−5x+3x−3x
(1 point)
Responses

4x
4 x

0
0

−10x
negative 10 x

16x
16 x
Question 4
4. Simplify 4x+6(3x−2)
(1 point)
Responses

10x−12
10 x minus 12

22x−2
22 x minus 2

18x−2
18 x minus 2

22x−12
22 x minus 12
Question 5
5. Simplify 13(9x − 5)
(1 point)
Responses

3x−53
3 x minus 5 thirds

6x−5
6 x minus 5

3x−5
3 x minus 5

6x−2
6 x minus 2
Question 6
6. Which factorization is equivalent to this expression?   30x+70
(1 point)
Responses

30(x+2)
30 times open paren x plus 2 close paren

10(3x+7)
10 times open paren 3 x plus 7 close paren

10(x+7)
10 times open paren x plus 7 close paren

7(3x+10)
7 times open paren 3 x plus 10 close paren
Question 7
7. Which factorization is equivalent to this expression?  81x−36
(1 point)
Responses

9x−4
9 x minus 4

9(9x−8)
9 times open paren 9 x minus 8 close paren

9(9x−4)
9 times open paren 9 x minus 4 close paren

−9(9x−4)
negative 9 times open paren 9 x minus 4 close paren
Question 8
8. Which is the complete factorization of this expression?  15x−3y
(1 point)
Responses

5(3x−y)
5 times open paren 3 x minus y close paren

3(5x−3)
3 times open paren 5 x minus 3 close paren

3(x−3y)
3 times open paren x minus 3 y close paren

3(5x−y)
3 times open paren 5 x minus y close paren
Question 9
9. Which is the complete factorization of this expression?  −24x+64
(1 point)
Responses

−8(3x+8)
negative 8 times open paren 3 x plus 8 close paren

8(2x−8)
8 times open paren 2 x minus 8 close paren

−8(x+8)
negative 8 times open paren x plus 8 close paren

−8(3x−8)
negative 8 times open paren 3 x minus 8 close paren
Question 10
10. Which is the complete factorization of this expression?  −20x−5y
(1 point)
Responses

5(4x+y)
5 times open paren 4 x plus y close paren

−5(4x+y)
negative 5 times open paren 4 x plus y close paren

−5(4x−y)
negative 5 times open paren 4 x minus y close paren

4(5x−y)
4 times open paren 5 x minus y close paren
Question 11
11. Simplify

 −(16−5x)
(1 point)
Responses

−5x−16
negative 5 x minus 16

5x+16
5 x plus 16

5x−16
5 x minus 16

−5x+16
negative 5 x plus 16
Question 12
12.  Determine the missing value to complete this equation.

6 + 10 - ___ = 6

(1 point)
Responses

10
10

-10
-10

6
6

-6
-6
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Answer 13

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