When jacob starts running, his legs move faster and his heart rate increases. which types of muscles are involved in these changes?
a.) skeletal muscles control his leg movement and smooth muscles control his heart rate.
b.) skeletal muscles control his leg movement and cardiac muscles control his heart rate.
c.) smooth muscles control his leg movement and cardiac muscles control his heart rate.
d.) skeletal muscles control both his leg movement and heart rate.

The most appropriate answer would be option B.

The voluntary movements such as leg movements, movement of hands, posture et cetera are controlled with the of skeletal muscles. These are striated muscles which are controlled with the help of the somatic nervous system.

The heart rate is regulated with the help of the autonomic nervous system which controls the cardiac muscles. Cardiac muscles are a special type of striated muscles which constitute the heart tissue.

tissue

explanation:

it is actually formed by geoup of cells which is tissue

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.