The conversion of pyruvate into acetyl CoA uses what enzyme?

Lab 2: The Muscular system
Q. In some versions of Muscular lab, students added ATP to fresh muscle fibers, which was supposed to cause them to shorten. However, it did not usually work; the fibers generally stayed the same length. Provide one possible reason for this lack of shortening.

Which of the following statements about the retina’s operation across different levels of ambient light is most accurate?

1. On-center retinal ganglion cells (RGCs) respond to a small spot of light in the center of its receptive field over an extremely small range of ambient intensities.
2. Off-center RGCs respond to a small spot of light in the center of its receptive field over a broad range of ambient intensities.
3. RGCs generally do not report absolute ambient light intensities, but rather encode relative intensity differences between its receptive field center and surround.
4. Interactions within the outer plexiform layer do not play an important role in modulating the photic sensitivity of ganglion cells.
5. Back-propagating action potentials from RGC targets in the ventral posterolateral thalamic nuclei alter light sensitivity.

A student with intractable epilepsy had their corpus callosum surgically severed in an effort to limit the spread of the seizures.  This procedure resulted in a disruption of…

1. Axons arising from glutamatergic neurons in Layer 2/3 of the cortex that project to the thalamus and are born first during embryonic cortical neurogenesis.
2. Axons arising from dopaminergic neurons in Layer 5 of the cortex that project to the striatum and are born during the middle of the period of embryonic cortical neurogenesis.
3. Axons arising from glutamatergic neurons in Layer 2/3 of the cortex that project to other regions of the cortex and are born last during embryonic cortical neurogenesis.
4. Axons arising from glutamatergic neurons in Layer 5 of the cortex that are born first during embryonic cortical neurogenesis.
5. None of the above

A colleague has made a new mouse model that exhibits selectively loss of Vglut2 (a protein involved in loading glutamate into vesicles) in neurons of the subthalamic nucleus. This results in a reduction in indirect pathway glutamatergic output from the basal ganglia. The mouse most likely exhibits... a. Inability to initiate movements b. Hyperlocomotion c. Enhanced visual responsiveness d. Loss of auditory function

During your shift as an emergency room physician, you admit a patient who fell 30 feet while rock climbing onto rocky terrain. Upon examination, the patient has reduced voluntary motor control of his right leg, a loss of pain and temperature sensation in his left side from the hip down, and a loss of fine touch and proprioception in his right side from the hip down. What is the likely location of his spinal cord lesion?

1. A complete spinal cord lesion at L1
2. A partial lesion localized to the left side of the spinal cord six segments rostral to T7
3. A partial lesion localized to the right side of the spinal cord six segments caudal to T7
4. A complete spinal cord lesion three segments caudal to C8
5. A partial lesion localized to the right side of the spinal cord three segments rostral to S5

1. Do you think heart rate responses would be different to the different modes of exercise?  Why? What is the purpose/function of increasing heart during exercise? What factors influence increase in heart rate during exercise among the different modes?

Define lymphocyte development . Mention what happens during lymphocyte development.

Is it possible for nerves to regenerate, and if it is possible, where would you expect regeneration to occur, in the CNS or PNS, and why or why not? What part of a neuron can grow back, if at all?

1. Participants did the VO2 max test in running machine. Define RER and give the equation for RER. What type of substrate/fuel was the subject utilizing the most at baseline? What type of substrate/fuel was the subject utilizing the most at his/her O2max? What was the trend for RER from rest to O2max and why did this trend occur in physiological terms?

2.Do you think the subject’s O_2max would be higher or lower if the submaximal test was performed on a treadmill? Give the physiological reasoning for your answer.

During a facelift, the cosmetic surgeon accidentally severs the facial nerve on the right side of the face. What are some of the effects this would have on the patient, and what muscles are involved?

1.- Define homeostasis. Who was the first person to describe the phenomenon? Who was the first person to coin the term Homeostasis. Explain the processes involved in returning your body temperature to its 37°C set point during a run when your body temperature gets above 37°C.

2.-As you are sitting at your desk reviewing ANS 100 lectures during Spring 2020, you look out your window and notice a new species of animal. You remember reading about this new species Covidicus whoknowswhatitis on social media and that people don’t know much about it yet. So like a good Animal Science student you go outside to take a closer look. You see that there are lots of individuals of this species and they range in size from about 1g to 1000g. They are transparent and so you can see their internal organs (and you have superpowers so you know the weight of everything you look at!). You notice that one individual is 10g and has a 1g liver, you then notice another individual that is 30g and has a 3 g liver. In this species, does liver size scale allometrically or isometrically? Both animals turn around and now you see their kidneys. In the 10g species the kidney is 0.5g (yes, they have big kidneys) and in the 30g species the kidney is 1g. In this species, does the kidney scale allometrically or isometrically? Explain the difference between allometric and isometric scaling. Why do many physiological processes or anatomical structures scale allometrically?

7) Relate the three factors affecting the affinity of Hb for O2 on slide 77, to exercise. Does each have any connection to exercise?

8) Since a person always needs oxygen, why would the bronchioles have the ability to contract at all? Why would the trachea not have that ability?

1. In hemostasis

A.Erythropoietin stimulates erythrocyte production

B.Platelets stimulate the intrinsic pathway

C.von Willenbrand factor is an anticoagulant

D. Thrombin converts fibrinogen to fibrin

2.

Which of the following term and definition pair is correctly matched?

Group of answer choices

ESV : the volume of blood in the ventricle after the final filling

pacemaker potential : spontaneous depolarization

P wave : ventricle depolarization

systole : relaxation

3.

Which type of capillary would allow proteins to pass through the gaps between the endothelial cells?

Discontinuous

No capillaries allow proteins to pass through.

Fenestrated

Continuous

4.

When the ventricles are no longer acting as a syncytium and can't pump blood, they are in __________.

bradycardia

ventricular tachycardia

AV node block

fibrillation

Dr. Green is studying the role of rods in vision. Dr. Green applies a K⁺ channel blocker, which inhibits K⁺ channels, to rods in a Petri dish. Before and after adding the K⁺ channel blocker, Dr. Green also measures the concentration of neurotransmitters in the media of the Petri dish and the membrane potential of the rods. What does Dr. Green find? (Select all options that apply)

(a) Glutamate secretion decreases after addition of the K⁺ channel blocker

(b) The membrane of rods depolarizes after addition of the K⁺ channel blocker

(c) Serotonin secretion increases after addition of the K⁺ channel blocker

(d) Action potentials are generated in rods after addition of the K⁺ channel blocker

(e) cGMP secretion increases after addition of the K⁺ channel blocker

Discuss 3 benefits of improving nutrition during pregnancy.