Which of the following is an example of voluntary muscle activity?

a. scratching
b. movement of food down the intestine
c. heart contractions
d. movement of urine into the bladder

Which of the following muscles are used when breathing?
a. intercostal and pectoral
b. intercostal and the diaphragm
c. interosseous and the diaphragm
d. interosseous and pectoral

The third metacarpal bone of a horse is called the
a. splint bone
b. cannon bone
c. dewclaw
d. sesamoid bone

The patella is a _______ bone
a. long
b. flat
c. sesamoid
d. carpal

For the first one -- which ones happen "automatically"? which one is deliberate?

For the rest, use a good dictionary for veterinary medicine. Once you understand the specific terms, the answers will be obvious.
http://www.google.com/search?rlz=1C1GGGE_enUS379US379&gcx=w&sourceid=chrome&ie=UTF-8&q=veterinary+medical+dictionary

a. scratching is an example of voluntary muscle activity.

b. intercostal and the diaphragm muscles are used when breathing.
b. cannon bone is the third metacarpal bone of a horse.
c. sesamoid bone is the patella bone.

To determine the correct answer to each question, you can use your knowledge of anatomy and physiology, or you can do a quick internet search.

1. To determine which option is an example of voluntary muscle activity, you need to understand that voluntary muscles are under conscious control. So, you can consciously choose to perform an action using voluntary muscles. In this case, scratching is an action that you can consciously choose to do using muscles in your arm or hand. To confirm this answer, you can search for the definition of voluntary muscle activity or the examples of voluntary muscle activity.

2. To determine which muscles are used during breathing, you can use your knowledge of anatomy or search for the muscles involved in breathing. In this case, the diaphragm and intercostal muscles (between the ribs) play a crucial role in the breathing process. Again, you can search for the specific muscles involved in breathing to confirm the answer.

3. To identify the name of the third metacarpal bone in a horse, you can either use your knowledge of horse anatomy or search for the specific bone names in horses. In this case, the correct answer is the cannon bone. You can search for horse skeletal anatomy or specifically search for the different bones in a horse's leg to confirm the answer.

4. To determine the type of bone that the patella is, you can recall the different types of bone shapes (long, flat, sesamoid, carpal), or you can search for the characteristics of the patella. In this case, the patella is a sesamoid bone. You can search for the different types of bones or specifically search for information about the patella bone to confirm the answer.