Question

17) An IPSP (Inhibitory Postsynaptic Potential)

1. can result from the opening of potassium ion channels
2. can result from the opening of chloride ion channels
3. increases the membrane potential towards threshold
4. A & B
5. A & C
6. B & C

18) Saltatory Conduction

1. Occurs only in myelinated axons
2. Occurs in all axons
3. Allows action potentials to travel more quickly down an axon
4. A & B
5. A & C
6. B & C

19) A diarthrosis is:

1. A freely moveable joint
2. A slightly moveable joint
3. A immovable joint

20) The elbow joint

1. Consists of a single joint capsule enclosing two joints
2. Includes the humeroulnar joint
3. Includes the humeroradial joint
4. A & C
5. All of the above

21) The muscles of the rotator cuff include:

a. The teres minor

b The teres major

c. The triceps brachii

d. All of the above

e. None of the above

22) The flexor and crossed extensor reflex is

a. Initiated by a painful stimulus

2. Has two parts
3. Begins with the automatic withdrawal of a threatened body part
4. All of the above
5. None of the above

23) The reflex that when stimulated causes bradycardia, peripheral vasoconstriction and a blood shift is:

a. The mammalian diving reflex

2. A yawn
3. A photic sneeze reflex
4. None of the above

24) The cerebellum

1. Calculates the best way to perform a movement
2. Plays a role in language and problem solving
3. Recognizes and predicts sequences of events
4. All of the above
5. None of the above

25) The left hemisphere of the cerebrum is

a. Associated with linear reasoning

2. Connected to the right hemisphere via the corpus callosum
3. Associated with facial perception
4. A & B ab. A & C

ac. All of the above

26) The only cranial nerve necessary for life is :

a. Cranial Nerve I

2. Cranial Nerve VII
3. Cranial Nerve X
4. Cranial Nerve VIII

27) The ventral rami of the spinal nerves

a. Are arranged in a segmental pattern

2. Form the intercostal nerves
3. Have cutaneous branches to the skin
4. All of the above

28) The following is a nerve off of the cervical plexus

a. Phrenic nerve

2. Musculocutaneous nerve
3. Ulnar nerve
4. Median nerve

29) The triceps brachii is innervated by the:

a. Median nerve

2. Ulnar Nerve
3. Musculocutaneous Nerve
4. Radial Nerve

Answer 1

According to HOMEWORKLIB RULES i am giving first foue ANSWERS with explaination. And other answers i also give but without explaination...as much as possible...

Ans.17. option B is correct

IPSP is a temporary Higher polarization of postsynaptic membrane that caused by the flow of negatively charged ions into the postsynaptic cell. In this GABA receptors open this channel and that is permiable for chloride ions and When this channels open, chloride ions that are nagative chargable that can flow across the membrane. So we can say that This potential is result from the opening of chloride ion channels.

Ans.18. A&B

Saltatory conduction is type of action potentials that specially found in myelinated axons. And it rums from one node of Ranvier to the next node. This type of conduction is increased a action potential's conduction velocity.In this type of conduction function of myelin to acts as an electrical insulator. So we can say that This conduction Allows action potentials to travel more quickly down an axon.

Ans.19. (A) a freely movable joint

Ths is a most common type of joint that made-up from synovial tube. And in this joint there are synovial fluid is present so it canbe freely movable.All synovial joints are functionally classified as diarthroses. This joints allow to movement within a single acis of motion. Example: elbow joint.

Ans.20. (A) Consists of a single joint capsule enclosing two joints.

explaination

The lower arm consists of two bones, the radius and the ulna. This bone connect elbow to wrist.This joint the superior radioulnar joint are attached by a single and fibrous capsule. And this capsule is strengthened by ligaments at the sides, but it is slightly weak in front and behind. This joint capsule isolate and cover joints. This capsule made from two layers, out layer made from a fibres and inner layer made-up from synovial membrane.

Ans.21. (A)

Ans.22. (D)

Ans.26. (B).

Ans.29. (c).

​​​​​​