Mindy has been training to run in a marathon. finally, race day arrives and mindy registers for the race. mindy begins the marathon at the sound of the buzzer. how do mindy’s skeletal and muscular systems work together to her run? a. the bones transport energy to the muscles to her run faster. b. the muscles provide support for the bones and the bones transport oxygen. c. the muscles transport nutrients to the bones and joints. d. the skeleton provides support and the muscles move the bones.

The correct answer is option D, that is, the skeleton provides support and the muscles move the bones.

Explanation:

The musculoskeletal system provides support, form, movement, and stability to the body. It is formed of the bones of the skeleton, cartilage, muscles, ligaments, tendons, joints, and other kinds of connective tissue, which binds and supports the tissues and organs in combination.  

The skeleton offers support, and the muscles in the given case, that is, in her legs gets contract and relax in order to move the bones. They function in pairs of extensors and flexors so they possess the tendency to pull back the bones.  

120,630,890

step-by-step explanation:

110+10=120,620+10=630,880+10=890

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol